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#1 2021-07-21 02:04:30

rlocone0
Member
Registered: 2021-07-20
Posts: 5

Incorrect Resolution passed with KVM.

Hello All,

My monitor's native resolution is 5120x1440 @ 120.  But when the KVM is used on a Linux distro 1920x1080 @ 60 even though it is supposed for 4K.  xrandr only returns 1920x1080. 

I've tried to run cvt with the above resolution but then the screen turns black.  If I try a lower resolution I get 'configure crtc 0 failed'.

Screen 0: minimum 8 x 8, current 5120 x 1440, maximum 32767 x 32767
DP1 disconnected primary (normal left inverted right x axis y axis)
	Identifier: 0x42
	Timestamp:  84423264
	Subpixel:   unknown
	Clones:     HDMI1
	CRTCs:      0 1
	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
	Colorspace: Default
		supported: Default, RGB_Wide_Gamut_Fixed_Point, RGB_Wide_Gamut_Floating_Point, opRGB, DCI-P3_RGB_D65, BT2020_RGB, BT601_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, BT2020_CYCC, BT2020_YCC
	max bpc: 12
		range: (6, 12)
	Broadcast RGB: Automatic
		supported: Automatic, Full, Limited 16:235
	audio: auto
		supported: force-dvi, off, auto, on
	subconnector: Unknown
		supported: Unknown, VGA, DVI-D, HDMI, DP, Wireless, Native
	link-status: Good
		supported: Good, Bad
	non-desktop: 0
		range: (0, 1)
DP2 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x43
	Timestamp:  84423264
	Subpixel:   unknown
	Clones:
	CRTCs:      0 1
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter:
	Colorspace: Default
		supported: Default, RGB_Wide_Gamut_Fixed_Point, RGB_Wide_Gamut_Floating_Point, opRGB, DCI-P3_RGB_D65, BT2020_RGB, BT601_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601, opYCC_601, BT2020_CYCC, BT2020_YCC
	max bpc: 12
		range: (6, 12)
	Broadcast RGB: Automatic
		supported: Automatic, Full, Limited 16:235
	audio: auto
		supported: force-dvi, off, auto, on
	subconnector: Unknown
		supported: Unknown, VGA, DVI-D, HDMI, DP, Wireless, Native
	link-status: Good
		supported: Good, Bad
	non-desktop: 0
		range: (0, 1)
HDMI1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x44
	Timestamp:  84423264
	Subpixel:   unknown
	Clones:     DP1
	CRTCs:      0 1
	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 connected 1920x1080+0+0 (0x48) normal (normal left inverted right x axis y axis) 1190mm x 340mm
	Identifier: 0x45
	Timestamp:  84423264
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:
	CRTC:       0
	CRTCs:      0 1
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter:
	EDID:
		00ffffffffffff004c2d990f32373930
		321e0103807722782aa2a1ad4f46a724
		0e5054bfef80714f810081c08180a9c0
		b3009500d1c01a6800a0f0381f403020
		3a00a9504100001a000000fd0018781e
		a03c000a202020202020000000fc0043
		3439524739780a2020202020000000ff
		00484e4b4e4330303534390a202003d7
		f0027000000000000000000000000000
		00000000000000000000000000000000
		00000000000000000000000000000000
		00000000000000000000000000000000
		00000000000000000000000000000000
		00000000000000000000000000000000
		00000000000000000000000000000000
		0000000000000000000000000000009e
		2a9debf572e75a0fe8fff5b9d8bab1af
		b7fbaa3f96937c4f449f6abdda02ea1e
		555630cb6590aacdc48b2d9e38140e39
		79bf7ba795df2052d0979ac3cf9dbec6
		4617aa45ab06d01b4201674f8336cf6a
		d8ef09a6070e7c34e1174426b7ac789d
		dbace90e19df6099854ae44e16d6d48c
		50112a3e698dbe9beea62e71dbb65b05
		ccb4ac805ed7e5428173af037387e84c
	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)
  1920x1080 (0x48) 148.500MHz -HSync -VSync *current
        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
  1680x1050 (0x1b0) 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
  1600x900 (0x1b1) 108.000MHz +HSync +VSync
        h: width  1600 start 1624 end 1704 total 1800 skew    0 clock  60.00KHz
        v: height  900 start  901 end  904 total 1000           clock  60.00Hz
  1280x1024 (0x1b2) 135.000MHz +HSync +VSync
        h: width  1280 start 1296 end 1440 total 1688 skew    0 clock  79.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  75.02Hz
  1280x1024 (0x1b3) 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
  1440x900 (0x1b4) 88.750MHz +HSync -VSync
        h: width  1440 start 1488 end 1520 total 1600 skew    0 clock  55.47KHz
        v: height  900 start  903 end  909 total  926           clock  59.90Hz
  1280x800 (0x1b5) 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
  1152x864 (0x1b6) 108.000MHz +HSync +VSync
        h: width  1152 start 1216 end 1344 total 1600 skew    0 clock  67.50KHz
        v: height  864 start  865 end  868 total  900           clock  75.00Hz
  1280x720 (0x1b7) 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
  1024x768 (0x1b8) 78.750MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock  60.02KHz
        v: height  768 start  769 end  772 total  800           clock  75.03Hz
  1024x768 (0x1b9) 75.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1328 skew    0 clock  56.48KHz
        v: height  768 start  771 end  777 total  806           clock  70.07Hz
  1024x768 (0x1ba) 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
  832x624 (0x1bb) 57.284MHz -HSync -VSync
        h: width   832 start  864 end  928 total 1152 skew    0 clock  49.73KHz
        v: height  624 start  625 end  628 total  667           clock  74.55Hz
  800x600 (0x1bc) 50.000MHz +HSync +VSync
        h: width   800 start  856 end  976 total 1040 skew    0 clock  48.08KHz
        v: height  600 start  637 end  643 total  666           clock  72.19Hz
  800x600 (0x1bd) 49.500MHz +HSync +VSync
        h: width   800 start  816 end  896 total 1056 skew    0 clock  46.88KHz
        v: height  600 start  601 end  604 total  625           clock  75.00Hz
  800x600 (0x1be) 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 (0x1bf) 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
  640x480 (0x1c0) 31.500MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock  37.50KHz
        v: height  480 start  481 end  484 total  500           clock  75.00Hz
  640x480 (0x1c1) 31.500MHz -HSync -VSync
        h: width   640 start  664 end  704 total  832 skew    0 clock  37.86KHz
        v: height  480 start  489 end  492 total  520           clock  72.81Hz
  640x480 (0x1c2) 30.240MHz -HSync -VSync
        h: width   640 start  704 end  768 total  864 skew    0 clock  35.00KHz
        v: height  480 start  483 end  486 total  525           clock  66.67Hz
  640x480 (0x1c3) 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 (0x1c4) 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
  5120x1440_60.00 (0x1cd) 624.500MHz -HSync +VSync
        h: width  5120 start 5496 end 6048 total 6976 skew    0 clock  89.52KHz
        v: height 1440 start 1443 end 1453 total 1493           clock  59.96Hz
  3840x1440_60.00 (0x26f) 468.250MHz -HSync +VSync
        h: width  3840 start 4120 end 4536 total 5232 skew    0 clock  89.50KHz
        v: height 1440 start 1443 end 1453 total 1493           clock  59.94Hz
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x46
	Timestamp:  84423264
	Subpixel:   no subpixels
	Clones:
	CRTCs:      2
	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

I'd like to run the native resolution 'through' the KVM switch on a Linux arch environment.

Thanks for your time and attention,

Last edited by rlocone0 (2021-07-21 02:09:37)

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#2 2021-07-21 13:33:25

Lone_Wolf
Member
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 9,342

Re: Incorrect Resolution passed with KVM.

for clarity : 
KVM = Keyboard, Video , Mouse hardware switch ?
Your monitor is a DQHD also known as super ultra-wide ?

2 possible causes come to mind
- your videocard can't drive that resolution
- cables / kvm switch are not high enough specced to transfer so much data

What videocard / driver ?

Is the monitor resolution detected correctly when it's connected directly to the pc ?

you appear to be using a hdmi cable, which type is it ?
see https://en.wikipedia.org/wiki/HDMI#Cables


Welcome to archlinux forums

Last edited by Lone_Wolf (2021-07-21 13:33:50)


Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
Did you use the guided installer ? If yes, I can't help you.

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

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#3 2021-07-21 14:19:05

rlocone0
Member
Registered: 2021-07-20
Posts: 5

Re: Incorrect Resolution passed with KVM.

Lone_Wolf wrote:

for clarity : 
KVM = Keyboard, Video , Mouse hardware switch ?

CKLau 4Kx2K@60 4 port

Your monitor is a DQHD also known as super ultra-wide ?

Samsung LC49RG90SSNXZA

2 possible causes come to mind
- your videocard can't drive that resolution
- cables / KVM switch are not high enough specced to transfer so much data

What videocard / driver ?

Graphics:  Device-1: Intel HD Graphics 530 driver: i915 v: kernel
           Display: server: X.Org 1.20.12 driver: loaded: intel unloaded: fbdev,modesetting,vesa resolution: 1920x1080~60Hz
           OpenGL: renderer: Mesa Intel HD Graphics 530 (SKL GT2) v: 4.6 Mesa 21.1.5

Is the monitor resolution detected correctly when it's connected directly to the pc ?

HDMI2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1190mm x 340mm
   3840x1080     59.97 +
   3840x2160     30.00    25.00    24.00    29.97    23.98
   5120x1440     29.98
   2560x1440     59.95
   2560x1080     60.00    59.94
   1920x1080     60.00*   60.00    50.00    59.94
   1680x1050     59.88
   1600x900      60.00
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x800      59.91
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
   5120x1440_60.00  59.96
   3840x1440_60.00  59.94
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

you appear to be using a hdmi cable, which type is it ?

Cables that came with the KVM. 


see https://en.wikipedia.org/wiki/HDMI#Cables


Welcome to archlinux forums

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#4 2021-07-21 15:52:11

Lone_Wolf
Member
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 9,342

Re: Incorrect Resolution passed with KVM.

rlocone0 wrote:
Lone_Wolf wrote:

Is the monitor resolution detected correctly when it's connected directly to the pc ?

HDMI2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1190mm x 340mm
   3840x1080     59.97 +
   3840x2160     30.00    25.00    24.00    29.97    23.98
   5120x1440     29.98
   2560x1440     59.95
   2560x1080     60.00    59.94
   1920x1080     60.00*   60.00    50.00    59.94
   1680x1050     59.88
   1600x900      60.00
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x800      59.91
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
   5120x1440_60.00  59.96
   3840x1440_60.00  59.94
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

There's no sign of 5120x1440 @ 120 HZ , So the answer is no .
The monitor should have come with a hdmi cable from samsung  , probably labeled Premium High Speed or even Ultra High Speed .
Have you tested with that cable ?


As for the kvm switch :
that would be the CKLau-64Hua as shown at https://www.amazon.com/CKLau-Control-Co … B07HRBBLWN ?

If that's the model you have there's bad news : Its max resolution is stated as 4096x2160@60Hz, way below what you need.


Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
Did you use the guided installer ? If yes, I can't help you.

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

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#5 2021-07-24 15:54:42

rlocone0
Member
Registered: 2021-07-20
Posts: 5

Re: Incorrect Resolution passed with KVM.

There's no sign of 5120x1440 @ 120 HZ , So the answer is no .
The monitor should have come with an HDMI cable from Samsung  , probably labeled Premium High Speed or even Ultra High Speed .
Have you tested with that cable ?

Correct, tested with cable it came with.  Still no change in resolution.  I've also tested a cable that is marked with 8K @ 120. 

As for the KVM switch :
that would be the CKLau-64Hua as shown at https://www.amazon.com/CKLau-Control-Co … B07HRBBLWN ?

The model # that I have is exactly the same but with -3N.  This is the 3rd KVM switch I've tried.  Not sure where else to turn.

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#6 2021-07-24 16:17:14

rlocone0
Member
Registered: 2021-07-20
Posts: 5

Re: Incorrect Resolution passed with KVM.

xrandr --output HDMI2 --mode 4096x2160_60.00
xrandr: Configure crtc 0 failed

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#7 2021-07-24 19:07:32

Lone_Wolf
Member
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 9,342

Re: Incorrect Resolution passed with KVM.

It looks like you may have 2 issues and the kvm switch is secondary for now .
(even  a perfect 32k kvm switch won't solve the primary issue).

rlocone0 wrote:
Lone_Wolf wrote:

There's no sign of 5120x1440 @ 120 HZ , So the answer is no .
The monitor should have come with an HDMI cable from Samsung  , probably labeled Premium High Speed or even Ultra High Speed .
Have you tested with that cable ?

Correct, tested with cable it came with.  Still no change in resolution.  I've also tested a cable that is marked with 8K @ 120.

There are reports of intel HD graphics integrated gpus not being able to drive dual QHD monitors (5120x1440) .
Specs vary between processor family and generation, but here's an example of a Core I5-6300HQ with a HD 530 :
https://www.intel.com/content/www/us/en … tions.html

What processor does your system have ?
If unsure post sudo dmesg | grep smpboot .

Last edited by Lone_Wolf (2021-07-24 19:08:10)


Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
Did you use the guided installer ? If yes, I can't help you.

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

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#8 2021-07-28 14:43:09

rlocone0
Member
Registered: 2021-07-20
Posts: 5

Re: Incorrect Resolution passed with KVM.

I've tested the KVM with another Arch system with an AMD GPU dedicated graphics not on-board and I'm still having the same issues.  At this point for me and my workflow, I'd be willing to pay for what will work. 

System:    Host: arco Kernel: 5.13.5-zen1-1-zen x86_64 bits: 64 Desktop: bspwm 0.9.10 Distro: ArcoLinux 
Machine:   Type: Desktop System: Micro-Star product: MS-7B98 v: 1.0 serial: N/A 
           Mobo: Micro-Star model: Z390-A PRO (MS-7B98) v: 1.0 serial: J616234999 UEFI: American Megatrends v: 1.81 
           date: 10/23/2019 
CPU:       Info: 6-Core Intel Core i5-9400F [MCP] speed: 4001 MHz min/max: 800/4100 MHz 
Graphics:  Device-1: AMD Baffin [Radeon RX 460/560D / Pro 450/455/460/555/555X/560/560X] driver: amdgpu v: kernel 
           Display: server: X.Org 1.20.12 driver: loaded: amdgpu,ati unloaded: fbdev,modesetting,vesa 
           resolution: 1920x1080~60Hz 
           OpenGL: renderer: AMD Radeon RX 460 Graphics (POLARIS11 DRM 3.41.0 5.13.5-zen1-1-zen LLVM 12.0.1) 
           v: 4.6 Mesa 21.1.5 
Network:   Device-1: Intel Ethernet I219-V driver: e1000e 
           Device-2: Intel 82576 Gigabit Network driver: igb 
           Device-3: Intel 82576 Gigabit Network driver: igb 
Drives:    Local Storage: total: 15.98 TiB used: 76 GiB (0.5%) 
Info:      Processes: 246 Uptime: 17h 30m Memory: 23.42 GiB used: 6.55 GiB (28.0%) Shell: Bash inxi: 3.3.06

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#9 2021-07-29 11:13:38

Lone_Wolf
Member
From: Netherlands, Europe
Registered: 2005-10-04
Posts: 9,342

Re: Incorrect Resolution passed with KVM.

Most sites with specs fro the RX460 (including AMD site) don't list resolutions but I found one that does : https://www.gpuzoo.com/GPU-AMD/Radeon_RX_460.html

It lists 4096x3120 as max for HDMI, but 7680 x 4320 for DP 1.4 .

Using https://en.wikipedia.org/wiki/DisplayPort indicates the best cable for DP 1.4 is HBR3 with a max bandwidth of 25.92 GbIT/s .

Your 5120x1440@120 resolution is not mentioned there, but twice that (5120x2880@120)  is and needs 45.66 Gbit/s .
That indicates your screen would need half as much, or 22.83 Gbit/s .

I suggest you try to connect the screen directly to the RX460 using a DisplayPort cable of HBR3 specification or better.
Once that is verified to work at 5120x1440, 120 Hz with your screen direclty connected you can then look for a kvm switch with DisplayPort connectors that can handle that bandwidth.


one example is https://www.delock.com/produkte/S_11482/merkmale.html .


Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
Did you use the guided installer ? If yes, I can't help you.

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

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