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#1 2019-07-22 10:21:40

klapauzius
Member
Registered: 2019-07-22
Posts: 44

[SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

Hi there... I'm running Arch Linux on a Lenovo T480 and the T480 is connected to an external 4k-capable LG monitor via a Premium High Speed HDMI cable. That setup works out-of-the-box, if the HDMI cable uses the HDMI port of the T480.

However, I would like to use my docking station (Raidsonic IB-DK2102-C) which is connected to the docking station port of the T480.

With an Ubuntu 18.04 live-system this setup works out-of-the-box. Xserver starts, the eDP internal monitor runs at 1920x1080_60Hz and the DP1-2 external monitor runs at 4096x2160_30Hz. That is the expected behavior.

Therefore this is not a hardware, bios or thunderbolt issue.

Under Arch

$ uname -a
Linux hostname 5.2.1-arch1-1-ARCH #1 SMP PREEMPT Sun Jul 14 14:52:52 UTC 2019 x86_64 GNU/Linux
$ sudo Xorg -version
X.Org X Server 1.20.5
$ pacman -Q xorg-server
xorg-server 1.20.5-2
$ xrandr --version
xrandr program version       1.5.0
Server reports RandR version 1.6

I can not get the 4096x2160_30Hz mode to work.

When I do a

$ watch tail -n 32 ~/.local/share/xorg/Xorg.0.log

or a

$ watch tail -n 32 /var/log/Xorg.0.log

under Ubuntu or Arch, respectively, I get occasionally

(--) intel(0): HDMI max TMDS frequency 300000KHz

as an answer. But only under Arch there are

(II) intel(0): switch to mode 4096x2160@30.0 on DP1-2 using pipe 2, position (1920, 0), rotation normal, reflection none
(EE) intel(0): failed to set mode: No space left on device [28]

failures, whenever I try to use the 4096x2160_30Hz mode.

In order to get smart (in reality it gets worse every day, but don't mention that while I'm around) I have read the following articles:

https://wiki.archlinux.org/index.php/multihead
https://forums.gentoo.org/viewtopic-t-1 … art-0.html
https://fluxcoil.net/snippets/linux_4k_output
https://github.com/kevinlekiller/linux_ … erclocking
https://vadosware.io/post/using-both-in … ics-cards/

Before I am going to post the xrandr --verbose and the parse-edid outputs, I would like to ask, if anyone here can tell me, what Ubuntu and Arch are doing differently when trying to connect to a monitor over DPx-x (display port on usb-3 / thunderbolt )? Obviously that seems most likely to be the key here.

Before I start messing around with cvt12-modelines to reduce blanking times and to decrease the clock - which might not help at all because xrandr --verbose tells me, that 4096x2160_30Hz stays unter 300MHz (precisely it says 297MHz) - I would like to ask if there are any known bugs regarding the communication between Xserver/Kernel and 4k-monitors? 1920x1080_60Hz with a clock of 148.500MHz works by the way, not out of the box, but after a xrandr --output DP1-2 --mode 1920x1080 --rate 60.

So far I haven't found anything helpful with dmesg or journalctl. Any suggestions what to look or to grep for? I would be most grateful for any proficient help.

EDIT: minor edits and quote-tags replaced by code-tags

Last edited by klapauzius (2019-07-25 20:16:46)

Offline

#2 2019-07-22 13:05:37

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

$ xrandr --verbose

answers

Screen 0: minimum 8 x 8, current 6016 x 2160, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (0x4a) normal (normal left inverted right x axis y axis) 310mm x 170mm
	Identifier: 0x43
	Timestamp:  2747473
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       0
	CRTCs:      0 1 2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	EDID: 
		00ffffffffffff0030e4210500000000
		001a0104951f1178ea9d35945c558f29
		1e505400000001010101010101010101
		0101010101012e3680a070381f403020
		350035ae1000001a542b80a070381f40
		3020350035ae1000001a000000fe004c
		4720446973706c61790a2020000000fe
		004c503134305746362d535042370074
	BACKLIGHT: 371 
		range: (0, 1515)
	Backlight: 371 
		range: (0, 1515)
	scaling mode: Full aspect 
		supported: Full, Center, Full aspect
	max bpc: 12 
		range: (6, 12)
	Broadcast RGB: Automatic 
		supported: Automatic, Full, Limited 16:235
	link-status: Good 
		supported: Good, Bad
	non-desktop: 0 
		range: (0, 1)
  1920x1080 (0x4a) 138.700MHz +HSync -VSync *current +preferred
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock  66.68KHz
        v: height 1080 start 1083 end 1088 total 1111           clock  60.02Hz
  1920x1080 (0x17c) 138.500MHz +HSync -VSync
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock  66.59KHz
        v: height 1080 start 1083 end 1088 total 1111           clock  59.93Hz
  1920x1080 (0x17d) 110.920MHz +HSync -VSync
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock  53.33KHz
        v: height 1080 start 1083 end 1088 total 1111           clock  48.00Hz
  1680x1050 (0x17e) 119.000MHz +HSync -VSync
        h: width  1680 start 1728 end 1760 total 1840 skew    0 clock  64.67KHz
        v: height 1050 start 1053 end 1059 total 1080           clock  59.88Hz
  1400x1050 (0x17f) 122.000MHz +HSync +VSync
        h: width  1400 start 1488 end 1640 total 1880 skew    0 clock  64.89KHz
        v: height 1050 start 1052 end 1064 total 1082           clock  59.98Hz
  1600x900 (0x180) 118.997MHz -HSync +VSync
        h: width  1600 start 1696 end 1864 total 2128 skew    0 clock  55.92KHz
        v: height  900 start  901 end  904 total  932           clock  60.00Hz
  1600x900 (0x181) 118.250MHz -HSync +VSync
        h: width  1600 start 1696 end 1856 total 2112 skew    0 clock  55.99KHz
        v: height  900 start  903 end  908 total  934           clock  59.95Hz
  1600x900 (0x182) 97.500MHz +HSync -VSync
        h: width  1600 start 1648 end 1680 total 1760 skew    0 clock  55.40KHz
        v: height  900 start  903 end  908 total  926           clock  59.82Hz
  1280x1024 (0x183) 108.000MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
  1400x900 (0x184) 103.500MHz -HSync +VSync
        h: width  1400 start 1480 end 1624 total 1848 skew    0 clock  56.01KHz
        v: height  900 start  903 end  913 total  934           clock  59.96Hz
  1400x900 (0x185) 86.500MHz +HSync -VSync
        h: width  1400 start 1448 end 1480 total 1560 skew    0 clock  55.45KHz
        v: height  900 start  903 end  913 total  926           clock  59.88Hz
  1280x960 (0x186) 108.000MHz +HSync +VSync
        h: width  1280 start 1376 end 1488 total 1800 skew    0 clock  60.00KHz
        v: height  960 start  961 end  964 total 1000           clock  60.00Hz
  1368x768 (0x187) 85.860MHz -HSync +VSync
        h: width  1368 start 1440 end 1584 total 1800 skew    0 clock  47.70KHz
        v: height  768 start  769 end  772 total  795           clock  60.00Hz
  1368x768 (0x188) 85.250MHz -HSync +VSync
        h: width  1368 start 1440 end 1576 total 1784 skew    0 clock  47.79KHz
        v: height  768 start  771 end  781 total  798           clock  59.88Hz
  1368x768 (0x189) 72.250MHz +HSync -VSync
        h: width  1368 start 1416 end 1448 total 1528 skew    0 clock  47.28KHz
        v: height  768 start  771 end  781 total  790           clock  59.85Hz
  1280x800 (0x18a) 83.500MHz -HSync +VSync
        h: width  1280 start 1352 end 1480 total 1680 skew    0 clock  49.70KHz
        v: height  800 start  803 end  809 total  831           clock  59.81Hz
  1280x800 (0x18b) 71.000MHz +HSync -VSync
        h: width  1280 start 1328 end 1360 total 1440 skew    0 clock  49.31KHz
        v: height  800 start  803 end  809 total  823           clock  59.91Hz
  1280x720 (0x18c) 74.500MHz -HSync +VSync
        h: width  1280 start 1344 end 1472 total 1664 skew    0 clock  44.77KHz
        v: height  720 start  723 end  728 total  748           clock  59.86Hz
  1280x720 (0x18d) 74.480MHz -HSync +VSync
        h: width  1280 start 1336 end 1472 total 1664 skew    0 clock  44.76KHz
        v: height  720 start  721 end  724 total  746           clock  60.00Hz
  1280x720 (0x18e) 63.750MHz +HSync -VSync
        h: width  1280 start 1328 end 1360 total 1440 skew    0 clock  44.27KHz
        v: height  720 start  723 end  728 total  741           clock  59.74Hz
  1024x768 (0x18f) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
        v: height  768 start  771 end  777 total  806           clock  60.00Hz
  1024x576 (0x190) 46.995MHz -HSync +VSync
        h: width  1024 start 1064 end 1168 total 1312 skew    0 clock  35.82KHz
        v: height  576 start  577 end  580 total  597           clock  60.00Hz
  1024x576 (0x191) 46.500MHz -HSync +VSync
        h: width  1024 start 1064 end 1160 total 1296 skew    0 clock  35.88KHz
        v: height  576 start  579 end  584 total  599           clock  59.90Hz
  1024x576 (0x192) 42.000MHz +HSync -VSync
        h: width  1024 start 1072 end 1104 total 1184 skew    0 clock  35.47KHz
        v: height  576 start  579 end  584 total  593           clock  59.82Hz
  960x540 (0x193) 40.784MHz -HSync +VSync
        h: width   960 start  992 end 1088 total 1216 skew    0 clock  33.54KHz
        v: height  540 start  541 end  544 total  559           clock  60.00Hz
  960x540 (0x194) 40.750MHz -HSync +VSync
        h: width   960 start  992 end 1088 total 1216 skew    0 clock  33.51KHz
        v: height  540 start  543 end  548 total  562           clock  59.63Hz
  960x540 (0x195) 37.250MHz +HSync -VSync
        h: width   960 start 1008 end 1040 total 1120 skew    0 clock  33.26KHz
        v: height  540 start  543 end  548 total  556           clock  59.82Hz
  800x600 (0x196) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
        v: height  600 start  601 end  605 total  628           clock  60.32Hz
  800x600 (0x197) 36.000MHz +HSync +VSync
        h: width   800 start  824 end  896 total 1024 skew    0 clock  35.16KHz
        v: height  600 start  601 end  603 total  625           clock  56.25Hz
  864x486 (0x198) 32.901MHz -HSync +VSync
        h: width   864 start  888 end  976 total 1088 skew    0 clock  30.24KHz
        v: height  486 start  487 end  490 total  504           clock  60.00Hz
  864x486 (0x199) 32.500MHz -HSync +VSync
        h: width   864 start  888 end  968 total 1072 skew    0 clock  30.32KHz
        v: height  486 start  489 end  494 total  506           clock  59.92Hz
  864x486 (0x19a) 30.500MHz +HSync -VSync
        h: width   864 start  912 end  944 total 1024 skew    0 clock  29.79KHz
        v: height  486 start  489 end  494 total  500           clock  59.57Hz
  640x480 (0x19b) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
        v: height  480 start  490 end  492 total  525           clock  59.94Hz
  720x405 (0x19c) 22.500MHz -HSync +VSync
        h: width   720 start  744 end  808 total  896 skew    0 clock  25.11KHz
        v: height  405 start  408 end  413 total  422           clock  59.51Hz
  720x405 (0x19d) 22.176MHz -HSync +VSync
        h: width   720 start  728 end  800 total  880 skew    0 clock  25.20KHz
        v: height  405 start  406 end  409 total  420           clock  60.00Hz
  720x405 (0x19e) 21.750MHz +HSync -VSync
        h: width   720 start  768 end  800 total  880 skew    0 clock  24.72KHz
        v: height  405 start  408 end  413 total  419           clock  58.99Hz
  640x360 (0x19f) 18.000MHz -HSync +VSync
        h: width   640 start  664 end  720 total  800 skew    0 clock  22.50KHz
        v: height  360 start  363 end  368 total  376           clock  59.84Hz
  640x360 (0x1a0) 17.750MHz +HSync -VSync
        h: width   640 start  688 end  720 total  800 skew    0 clock  22.19KHz
        v: height  360 start  363 end  368 total  374           clock  59.32Hz
  640x360 (0x1a1) 17.187MHz -HSync +VSync
        h: width   640 start  640 end  704 total  768 skew    0 clock  22.38KHz
        v: height  360 start  361 end  364 total  373           clock  60.00Hz
DP1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x44
	Timestamp:  2747473
	Subpixel:   unknown
	Clones:     HDMI1
	CRTCs:      0 1 2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	max bpc: 12 
		range: (6, 12)
	Broadcast RGB: Automatic 
		supported: Automatic, Full, Limited 16:235
	audio: auto 
		supported: force-dvi, off, auto, on
	link-status: Good 
		supported: Good, Bad
	non-desktop: 0 
		range: (0, 1)
DP1-1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x26e
	Timestamp:  2747473
	Subpixel:   unknown
	Clones:     DP1-2
	CRTCs:      0 1 2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	max bpc: 12 
		range: (6, 12)
	Broadcast RGB: Automatic 
		supported: Automatic, Full, Limited 16:235
	audio: auto 
		supported: force-dvi, off, auto, on
	non-desktop: 0 
		range: (0, 1)
	link-status: Good 
		supported: Good, Bad
DP1-2 connected (normal left inverted right x axis y axis)
	Identifier: 0x26f
	Timestamp:  2747473
	Subpixel:   unknown
	Clones:     DP1-1
	CRTCs:      0 1 2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	EDID: 
		00ffffffffffff001e6d010001010101
		011c010380a05a780aee91a3544c9926
		0f5054a1080031404540614071408180
		01010101010108e80030f2705a80b058
		8a0040846300001e023a801871382d40
		582c450040846300001e000000fd003a
		791e883c000a202020202020000000fc
		004c472054560a202020202020200162
		02034bf1565d101f0413051403021220
		212215015e5f6263643f402f09570715
		07505507013d1ec05f7e016e030c0010
		00b83c20008001020304e200cfe305c0
		00e50e60616566e3060d01662150b051
		001b304070360040846300001e000000
		00000000000000000000000000000000
		00000000000000000000000000000018
	max bpc: 12 
		range: (6, 12)
	Broadcast RGB: Automatic 
		supported: Automatic, Full, Limited 16:235
	audio: auto 
		supported: force-dvi, off, auto, on
	non-desktop: 0 
		range: (0, 1)
	link-status: Good 
		supported: Good, Bad
  4096x2160 (0x1ef) 297.000MHz +HSync +VSync
        h: width  4096 start 4184 end 4272 total 4400 skew    0 clock  67.50KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  30.00Hz
  4096x2160 (0x1f0) 297.000MHz +HSync +VSync
        h: width  4096 start 5064 end 5152 total 5280 skew    0 clock  56.25KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  25.00Hz
  4096x2160 (0x1f1) 297.000MHz +HSync +VSync
        h: width  4096 start 5116 end 5204 total 5500 skew    0 clock  54.00KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  24.00Hz
  4096x2160 (0x1f2) 296.703MHz +HSync +VSync
        h: width  4096 start 4184 end 4272 total 4400 skew    0 clock  67.43KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  29.97Hz
  4096x2160 (0x1f3) 296.703MHz +HSync +VSync
        h: width  4096 start 5116 end 5204 total 5500 skew    0 clock  53.95KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  23.98Hz
  3840x2160 (0x1f4) 297.000MHz +HSync +VSync
        h: width  3840 start 4016 end 4104 total 4400 skew    0 clock  67.50KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  30.00Hz
  3840x2160 (0x1f5) 297.000MHz +HSync +VSync
        h: width  3840 start 4896 end 4984 total 5280 skew    0 clock  56.25KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  25.00Hz
  3840x2160 (0x1f6) 297.000MHz +HSync +VSync
        h: width  3840 start 5116 end 5204 total 5500 skew    0 clock  54.00KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  24.00Hz
  3840x2160 (0x1f7) 296.703MHz +HSync +VSync
        h: width  3840 start 4016 end 4104 total 4400 skew    0 clock  67.43KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  29.97Hz
  3840x2160 (0x1f8) 296.703MHz +HSync +VSync
        h: width  3840 start 5116 end 5204 total 5500 skew    0 clock  53.95KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  23.98Hz
  1920x1080 (0x1f9) 297.000MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock 135.00KHz
        v: height 1080 start 1084 end 1089 total 1125           clock 120.00Hz
  1920x1080 (0x1fa) 297.000MHz +HSync +VSync
        h: width  1920 start 2448 end 2492 total 2640 skew    0 clock 112.50KHz
        v: height 1080 start 1084 end 1089 total 1125           clock 100.00Hz
  1920x1080 (0x1fb) 296.703MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock 134.87KHz
        v: height 1080 start 1084 end 1089 total 1125           clock 119.88Hz
  1920x1080 (0x1fc) 148.500MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.50KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  60.00Hz
  1920x1080 (0x1fd) 148.500MHz +HSync +VSync
        h: width  1920 start 2448 end 2492 total 2640 skew    0 clock  56.25KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  50.00Hz
  1920x1080 (0x1fe) 148.352MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.43KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  59.94Hz
  1920x1080 (0x201) 74.250MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  33.75KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  30.00Hz
  1920x1080 (0x202) 74.250MHz +HSync +VSync
        h: width  1920 start 2448 end 2492 total 2640 skew    0 clock  28.12KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  25.00Hz
  1920x1080 (0x203) 74.250MHz +HSync +VSync
        h: width  1920 start 2558 end 2602 total 2750 skew    0 clock  27.00KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  24.00Hz
  1920x1080 (0x205) 74.176MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  33.72KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  29.97Hz
  1920x1080 (0x206) 74.176MHz +HSync +VSync
        h: width  1920 start 2558 end 2602 total 2750 skew    0 clock  26.97KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  23.98Hz
  1280x1024 (0x183) 108.000MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
  1360x768 (0x207) 85.500MHz +HSync +VSync
        h: width  1360 start 1424 end 1536 total 1792 skew    0 clock  47.71KHz
        v: height  768 start  771 end  777 total  795           clock  60.02Hz
  1152x864 (0x208) 81.579MHz -HSync +VSync
        h: width  1152 start 1216 end 1336 total 1520 skew    0 clock  53.67KHz
        v: height  864 start  865 end  868 total  895           clock  59.97Hz
  1280x720 (0x209) 74.250MHz +HSync +VSync
        h: width  1280 start 1390 end 1430 total 1650 skew    0 clock  45.00KHz
        v: height  720 start  725 end  730 total  750           clock  60.00Hz
  1280x720 (0x20a) 74.250MHz +HSync +VSync
        h: width  1280 start 1720 end 1760 total 1980 skew    0 clock  37.50KHz
        v: height  720 start  725 end  730 total  750           clock  50.00Hz
  1280x720 (0x20b) 74.176MHz +HSync +VSync
        h: width  1280 start 1390 end 1430 total 1650 skew    0 clock  44.96KHz
        v: height  720 start  725 end  730 total  750           clock  59.94Hz
  1024x768 (0x18f) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
        v: height  768 start  771 end  777 total  806           clock  60.00Hz
  800x600 (0x196) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
        v: height  600 start  601 end  605 total  628           clock  60.32Hz
  720x576 (0x20c) 27.000MHz -HSync -VSync
        h: width   720 start  732 end  796 total  864 skew    0 clock  31.25KHz
        v: height  576 start  581 end  586 total  625           clock  50.00Hz
  720x480 (0x20e) 27.027MHz -HSync -VSync
        h: width   720 start  736 end  798 total  858 skew    0 clock  31.50KHz
        v: height  480 start  489 end  495 total  525           clock  60.00Hz
  720x480 (0x20f) 27.000MHz -HSync -VSync
        h: width   720 start  736 end  798 total  858 skew    0 clock  31.47KHz
        v: height  480 start  489 end  495 total  525           clock  59.94Hz
  640x480 (0x210) 25.200MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.50KHz
        v: height  480 start  490 end  492 total  525           clock  60.00Hz
  640x480 (0x19b) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
        v: height  480 start  490 end  492 total  525           clock  59.94Hz
  720x400 (0x211) 28.320MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock  31.47KHz
        v: height  400 start  412 end  414 total  449           clock  70.08Hz
DP2 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x45
	Timestamp:  2747473
	Subpixel:   unknown
	Clones:     HDMI2
	CRTCs:      0 1 2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	max bpc: 12 
		range: (6, 12)
	Broadcast RGB: Automatic 
		supported: Automatic, Full, Limited 16:235
	audio: auto 
		supported: force-dvi, off, auto, on
	link-status: Good 
		supported: Good, Bad
	non-desktop: 0 
		range: (0, 1)
HDMI1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x46
	Timestamp:  2747473
	Subpixel:   unknown
	Clones:     DP1
	CRTCs:      0 1 2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	max bpc: 12 
		range: (8, 12)
	content type: No Data 
		supported: No Data, Graphics, Photo, Cinema, Game
	Colorspace: Default 
		supported: Default, SMPTE_170M_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, opRGB, BT2020_CYCC, BT2020_RGB, BT2020_YCC, DCI-P3_RGB_D65, DCI-P3_RGB_Theater
	aspect ratio: Automatic 
		supported: Automatic, 4:3, 16:9
	Broadcast RGB: Automatic 
		supported: Automatic, Full, Limited 16:235
	audio: auto 
		supported: force-dvi, off, auto, on
	link-status: Good 
		supported: Good, Bad
	non-desktop: 0 
		range: (0, 1)
HDMI2 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x47
	Timestamp:  2747473
	Subpixel:   unknown
	Clones:     DP2
	CRTCs:      0 1 2
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	max bpc: 12 
		range: (8, 12)
	content type: No Data 
		supported: No Data, Graphics, Photo, Cinema, Game
	Colorspace: Default 
		supported: Default, SMPTE_170M_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, opRGB, BT2020_CYCC, BT2020_RGB, BT2020_YCC, DCI-P3_RGB_D65, DCI-P3_RGB_Theater
	aspect ratio: Automatic 
		supported: Automatic, 4:3, 16:9
	Broadcast RGB: Automatic 
		supported: Automatic, Full, Limited 16:235
	audio: auto 
		supported: force-dvi, off, auto, on
	link-status: Good 
		supported: Good, Bad
	non-desktop: 0 
		range: (0, 1)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x48
	Timestamp:  2747473
	Subpixel:   no subpixels
	Clones:    
	CRTCs:      3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	non-desktop: 0 
		supported: 0, 1

and

$ cat /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-2/edid| parse-edid

gives me a

Checksum Correct

Section "Monitor"
	Identifier "LG TV"
	ModelName "LG TV"
	VendorName "GSM"
	# Monitor Manufactured week 1 of 2018
	# EDID version 1.3
	# Digital Display
	DisplaySize 1600 900
	Gamma 2.20
	Option "DPMS" "false"
	Horizsync 30-136
	VertRefresh 58-121
	# Maximum pixel clock is 600MHz
	#Not giving standard mode: 640x480, 60Hz
	#Not giving standard mode: 800x600, 60Hz
	#Not giving standard mode: 1024x768, 60Hz
	#Not giving standard mode: 1152x864, 60Hz
	#Not giving standard mode: 1280x1024, 60Hz

	#Extension block found. Parsing...
#WARNING: I may have missed a mode (CEA mode 93)
#DOUBLE WARNING: It's your first mode, too, so this may actually be important.
#WARNING: I may have missed a mode (CEA mode 94)
#WARNING: I may have missed a mode (CEA mode 95)
#WARNING: I may have missed a mode (CEA mode 98)
#WARNING: I may have missed a mode (CEA mode 99)
#WARNING: I may have missed a mode (CEA mode 100)
#WARNING: I may have missed a mode (CEA mode 63)
#WARNING: I may have missed a mode (CEA mode 64)
	Modeline 	"Mode 16" 85.50 1360 1424 1536 1792 768 771 777 795 +hsync +vsync 
	Modeline 	"Mode 0" 594.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync 
	Modeline 	"Mode 1" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync 
	Modeline 	"Mode 2" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
	Modeline 	"Mode 3" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
	Modeline 	"Mode 4" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync
	Modeline 	"Mode 5" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
	Modeline 	"Mode 6" 74.250 1920 2008 2052 2200 1080 1082 1087 1125 +hsync +vsync interlace
	Modeline 	"Mode 7" 74.250 1920 2448 2492 2640 1080 1082 1089 1125 +hsync +vsync interlace
	Modeline 	"Mode 8" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
	Modeline 	"Mode 9" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
	Modeline 	"Mode 10" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync
	Modeline 	"Mode 11" 74.250 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
	Modeline 	"Mode 12" 74.250 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
	Modeline 	"Mode 13" 74.250 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
	Modeline 	"Mode 14" 27.000 1440 1464 1590 1728 576 578 581 625 -hsync -vsync interlace
	Modeline 	"Mode 15" 25.200 640 656 752 800 480 490 492 525 -hsync -vsync
	Option "PreferredMode" "Mode 16"
EndSection

which is identical to what I see when I plug the 4k-monitor into HDMI2 and do a

$  cat /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid |parse-edid

EDIT: changed quote-tags to code-tags

Last edited by klapauzius (2019-07-22 13:25:47)

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#3 2019-07-22 13:07:55

Lone_Wolf
Forum Moderator
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 11,921

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

Sounds like this couold be a kernel module or driver issue.
You appear to be using an integrated intel GPU, those tend to be good at hdmi support, but buggy with DP .

post output of pacman Qs xf86- and lspci -k (while docked)

EDIT : use [ code ] tags instead of quote tags please, see https://bbs.archlinux.org/help.php#bbcode

Last edited by Lone_Wolf (2019-07-22 13:09:41)

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.


(A works at time B)  && (time C > time B ) ≠  (A works at time C)

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#4 2019-07-22 13:36:12

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

pacman -Qs xf86-

returns

local/xf86-input-evdev 2.10.6-1 (xorg-drivers)
    X.org evdev input driver
local/xf86-input-keyboard 1.9.0-3 (xorg-drivers)
    X.Org keyboard input driver
local/xf86-input-libinput 0.28.2-1 (xorg-drivers)
    Generic input driver for the X.Org server based on libinput
local/xf86-input-mouse 1.9.3-1 (xorg-drivers)
    X.org mouse input driver
local/xf86-input-synaptics 1.9.1-1 (xorg-drivers)
    Synaptics driver for notebook touchpads
local/xf86-input-vmmouse 13.1.0-4 (xorg-drivers)
    X.org VMWare Mouse input driver
local/xf86-input-void 1.4.1-4 (xorg-drivers)
    X.org void input driver
local/xf86-video-amdgpu 19.0.1-1 (xorg-drivers)
    X.org amdgpu video driver
local/xf86-video-ati 1:19.0.1-1 (xorg-drivers)
    X.org ati video driver
local/xf86-video-dummy 0.3.8-3 (xorg-drivers)
    X.org dummy video driver
local/xf86-video-fbdev 0.5.0-1 (xorg-drivers)
    X.org framebuffer video driver
local/xf86-video-intel 1:2.99.917+865+g60022507-1 (xorg-drivers)
    X.org Intel i810/i830/i915/945G/G965+ video drivers
local/xf86-video-nouveau 1.0.16-1 (xorg-drivers)
    Open Source 3D acceleration driver for nVidia cards
local/xf86-video-openchrome 0.6.0-3 (xorg-drivers)
    X.Org Openchrome drivers
local/xf86-video-qxl 0.1.5-7 (xorg-drivers)
    Xorg X11 qxl video driver
local/xf86-video-vesa 2.4.0-2 (xorg-drivers xorg)
    X.org vesa video driver
local/xf86-video-vmware 13.3.0-1 (xorg-drivers)
    X.org vmware video driver
local/xf86-video-voodoo 1.2.5-10 (xorg-drivers)
    X.org 3dfx Voodoo1/Voodoo2 2D video driver

and

lspci -k

gives me

00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 08)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: skl_uncore
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)
	Subsystem: Lenovo UHD Graphics 620
	Kernel driver in use: i915
	Kernel modules: i915
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 08)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: proc_thermal
	Kernel modules: processor_thermal_device
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th Gen Core Processor Gaussian Mixture Model
	Subsystem: Lenovo ThinkPad T480
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: xhci_hcd
	Kernel modules: xhci_pci
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: intel_pch_thermal
	Kernel modules: intel_pch_thermal
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: intel-lpss
	Kernel modules: intel_lpss_pci
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: mei_me
	Kernel modules: mei_me
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: ahci
	Kernel modules: ahci
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #1 (rev f1)
	Kernel driver in use: pcieport
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 (rev f1)
	Kernel driver in use: pcieport
00:1c.6 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #7 (rev f1)
	Kernel driver in use: pcieport
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #9 (rev f1)
	Kernel driver in use: pcieport
00:1f.0 ISA bridge: Intel Corporation Sunrise Point LPC Controller/eSPI Controller (rev 21)
	Subsystem: Lenovo ThinkPad T480
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
	Subsystem: Lenovo ThinkPad T480
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel, snd_soc_skl
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: i801_smbus
	Kernel modules: i2c_i801
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (4) I219-V (rev 21)
	Subsystem: Lenovo ThinkPad T480
	Kernel driver in use: e1000e
	Kernel modules: e1000e
02:00.0 Non-Volatile memory controller: Toshiba America Info Systems Device 0113 (rev 01)
	Subsystem: Toshiba America Info Systems Device 0001
	Kernel driver in use: nvme
03:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
	Subsystem: Intel Corporation Dual Band Wireless-AC 8265
	Kernel driver in use: iwlwifi
	Kernel modules: iwlwifi, wl
04:00.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
	Kernel driver in use: pcieport
05:00.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
	Kernel driver in use: pcieport
05:01.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
	Kernel driver in use: pcieport
05:02.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
	Kernel driver in use: pcieport
06:00.0 System peripheral: Intel Corporation JHL6240 Thunderbolt 3 NHI (Low Power) [Alpine Ridge LP 2016] (rev 01)
	Subsystem: Device 2222:1111
	Kernel driver in use: thunderbolt
	Kernel modules: thunderbolt
3c:00.0 USB controller: Intel Corporation Device 15c1 (rev 01)
	Subsystem: Device 2222:1111
	Kernel driver in use: xhci_hcd
	Kernel modules: xhci_pci

Docking station and 4k-monitor are pluged in, but 4k-monitor says "no signal".

xrandr --output DP1-2 --mode 1920x1080 --rate 60 --pos 1920x0

brings 4k-monitor back to live, however not in 4k.

Last edited by klapauzius (2019-07-22 14:03:52)

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#5 2019-07-22 14:00:27

Lone_Wolf
Forum Moderator
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 11,921

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

The lspci output looks normal, I think you installed xorg-drivers group completely ?
You don't need most of them, for now remove all xf86-video-* drivers EXCEPT xf86-video-intel .

Check xorg log on ubuntu, does it use intel or modesetting driver ?
If you're not sure, use a pastebin client to post that log.

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.


(A works at time B)  && (time C > time B ) ≠  (A works at time C)

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#6 2019-07-22 14:07:56

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

I will, thanks a lot, Lone_Wolf. smile

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#7 2019-07-22 15:49:29

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

Indeed, in ~/.local/share/xorg/xorg.0.log of the ubuntu live-system it says 'modeset(0):' instead of 'intel(0):' and as mentioned above it doesn't throw a 'failed to set mode: No space left on device [28]' failure.

So, I have read

https://wiki.archlinux.org/index.php/ke … de_setting and
https://bbs.archlinux.org/viewtopic.php?id=241397

Then I added a  'MODULES=(i915)' in /etc/mkinitcpio.conf, did a 'mkinitcpio -p linux' and rebooted.

In my /var/log/xorg.0.log it still says 'intel(0):'...

cat /etc/X11/xorg.conf.d/20-intel.conf

gives me

Section "Device"
    Identifier  "Intel Graphics"
    Driver      "intel"
    Option      "TearFree" "true"
EndSection

Lone_Wolf, how do you think about changing the Driver to "modeset"? Or moving the file to '20-intel.bak'?

Just to go sure... in case I fuck up the system beyond repair, in /boot/loader/loader.conf it says 'editor yes', so I should be able to start the system with different kernel options, i.e. add an 's' for single user mode... (I use systemd-boot, though smile )

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#8 2019-07-22 20:17:12

Slithery
Administrator
From: Norfolk, UK
Registered: 2013-12-01
Posts: 5,776

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

To use the modesetting driver just remove the xf86-video-intel package...
https://wiki.archlinux.org/index.php/In … stallation

No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

aur - dotfiles

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#9 2019-07-23 08:07:47

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

That worked half the way. After uninstalling the xf84-video-* packages / video-drivers the Xserver is using the modesetting driver.

However I still can't get 4k on the display port to work.

xrandr --output DP-2-2 --mode 1920x1080 --rate 60 --pos 1920

works.

xrandr --output DP-2-2 --mode 4096x2160 --rate 30 --pos 1920x0 --verbose

returns

screen 0: 6016x2160 1593x572 mm  95.92dpi
crtc 1:    4096x2160  24.00 +1920+0 "DP-2-2"
xrandr: Configure crtc 1 failed
crtc 0: disable
crtc 1: disable
crtc 2: disable
screen 0: revert
crtc 0: revert
crtc 1: revert
crtc 2: revert

and

grep 'EE' /var/log/Xorg.0.log

returns

        
    26.683] Current Operating System: Linux ----- 5.2.2-arch1-1-ARCH #1 SMP PREEMPT Sun Jul 21 19:18:34 UTC 2019 x86_64
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    26.715] (EE) Failed to load module "intel" (module does not exist, 0)
[    26.719] (EE) Failed to load module "fbdev" (module does not exist, 0)
[    26.719] (EE) Failed to load module "vesa" (module does not exist, 0)
[    29.232] (II) Initializing extension MIT-SCREEN-SAVER
[   116.341] (EE) modeset(0): failed to set mode: No space left on device
[   196.823] (EE) modeset(0): failed to set mode: No space left on device
[   201.699] (EE) client bug: timer event16 tap: offset negative (-227ms)
[   206.844] (EE) modeset(0): failed to set mode: No space left on device
[   214.975] (EE) modeset(0): failed to set mode: No space left on device
[   214.975] (EE) modeset(0): failed to set mode: No space left on device
[   496.244] (EE) modeset(0): failed to set mode: No space left on device
[  2697.793] (EE) modeset(0): failed to set mode: No space left on device
[  2701.630] (EE) client bug: timer event16 tap: offset negative (-273ms)
[  2708.054] (EE) modeset(0): failed to set mode: No space left on device
[  2756.823] (EE) modeset(0): failed to set mode: No space left on device
[  2765.494] (EE) client bug: timer event16 tap: offset negative (-88ms)

Btw, when connecting the monitor to the machine, Xserver freezes for 5 to 15 seconds. Did that while using the intel-drivers as well. In the Xserver-log it does not say anything about an Xserver crash though.

I could try to tell the Xserver to be more verbose, but I kind of tend to believe the failure is due to the kernel...

Last edited by klapauzius (2019-09-23 17:11:35)

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#10 2019-07-23 12:56:38

Lone_Wolf
Forum Moderator
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 11,921

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

Post full xorg log please.

This does look like it's a lower level issue, install linux-lts (can coexist with normal kernel) boot it and verify if the problem persists.

Last edited by Lone_Wolf (2019-07-23 12:57:01)

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.


(A works at time B)  && (time C > time B ) ≠  (A works at time C)

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#11 2019-07-24 11:49:00

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

The LTS-Kernel did the trick. I rolled back (most of) the changes and for now I am going to use the LTS-Kernel. Thanks für your patience and support.

However, if you like do give me further guidance, we could dig deeper into the logs and file a bug report to the kernel maintainer.

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#12 2019-07-24 11:58:40

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

Otherwise I am going to mark the topic as [SOLVED].

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#13 2019-07-24 12:04:03

Lone_Wolf
Forum Moderator
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 11,921

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

that's  a bit beyond my skills, but there are other forum users that can help with that.

We now know that the problem is with the i915 kernel module, has to do with multihead and works with linux-lts .
I suggest you start a separate thread to investigate further.

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.


(A works at time B)  && (time C > time B ) ≠  (A works at time C)

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#14 2019-09-22 07:30:42

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

There was a regression in the 5.2-kernel.

4k with Display-Port works again under the 5.3.0-arch1-1-ARCH kernel.

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#15 2019-09-22 13:57:02

vitor
Member
Registered: 2010-11-29
Posts: 30

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

Hi klapauzius, do you feel that the system is very slow (page refresh, typing in terminal (termite)) etc? I'm using x250, dock station and display port with external 4k monitor. I uninstalled xf86-video-intel and I'm using just mesa package. My kernel is 5.3.0-arch1-1-ARCH

Last edited by vitor (2019-09-22 14:02:22)

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#16 2019-09-23 17:08:38

klapauzius
Member
Registered: 2019-07-22
Posts: 44

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

Hi vitor, from the distance I can't tell how slow you mean by "very slow", but the intel-gpu can - afaik - only provide 30Hz when serving 4k. My impression is that overall performance is suppressed also, that might be the case since CPU and Intel-GPU are sharing the RAM.

You might want to have a look inside the Xorg.log...

rg 'Kernel Mode Setting' /var/log/Xorg.0.log
75:[    29.768] (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20190619

(rg is ripgrep)

Last edited by klapauzius (2019-09-23 17:10:10)

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#17 2019-09-25 01:41:39

vitor
Member
Registered: 2010-11-29
Posts: 30

Re: [SOLVED] Xserver or Kernel fail to setup DP1-2 with 4k correctly

Hi Klapauzius, thanks for you answer. I guess it was something with the compton package (I use i3), I disable it and everything is now way more smooth than before.

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