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#1 2025-02-22 08:52:57

cakehunter
Member
Registered: 2024-04-05
Posts: 16

[SOLVED]Need a lower refresh rate on my laptop's monitor

One way is to add a custom edid in xorg.conf file.
https://unix.stackexchange.com/a/685477/716488
But my xorg.conf is empty. When I try to create one using nvidia-settings, system doesn't boot and stops at 

[ok] reached target graphical interface on boot.

If I then remove the xorg.conf from /etc/X11/ , the system boots properly



xrandr output:

❯ xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 298mm
   1920x1080     60.00*+ 144.00   119.98   119.88   100.00    99.93    74.99    59.94    50.00  
   1440x900     119.85  
   1280x1024    119.96    75.02    60.02  
   1280x960     100.00  
   1280x720      59.94    50.00  
   1024x768     119.99    75.03    60.00  
   800x600      119.97   100.00    75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480      120.01    75.00    59.94    59.93  
DP-4 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080    165.00*+

Last edited by cakehunter (2025-02-25 14:05:48)

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#2 2025-02-22 15:57:21

seth
Member
From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 74,307

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

https://wiki.archlinux.org/title/Kernel … s_and_EDID

Afaik only the nvidia driver accepts a custom edid in the xorg config but even if you're using that, you most certainly don't want to use nvidia-settings to write a static server layout.
Please post your Xorg log, https://wiki.archlinux.org/title/Xorg#General

How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

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#3 2025-02-22 18:49:59

cakehunter
Member
Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

https://wiki.archlinux.org/title/Kernel … s_and_EDID
Tried adding the custom_edid.bin to the kernel parameter but it didnt make any different. Also tried one of the standard timings i.e "edid/1920x1080.bin" but it still didnt make any difference.

I really need to turn down the refresh rate when on battery. The laptop's different refresh rates are actually available when I turn on hybrid graphics in BIOS menu, but when on discrete graphics it seems only the 165hz is available. I don't want to use hybrid mode.

xorg log: http://0x0.st/8T21.txt
journalctl -b: http://0x0.st/8T2t.txt

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#4 2025-02-22 20:22:07

seth
Member
From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 74,307

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

I really need to turn down the refresh rate when on battery … I don't want to use hybrid mode.

Is DP-4 actually the internal panel of a notebook?
You do understand that you're most likely micro-optimizing one problem while wasting heaps of battery somewhere else?
Esp. if the outputs are not hard-wired to the nvidia GPU (ie. you can shut that off completely)

However w/ the nvidia driver, /etc/X11/xorg.conf.d/20-nvidia.conf

Section "Device"                                                                                                                
    Identifier "RTX 3060" 
    Driver  "nvidia"
    Option "CustomEDID" "DFP-4:/path/to/lg_edid.bin; DFP-5:/path/to/boe_edid.bin"
EndSection

should™ just work?

Also 165Hz smells like VRR, 

xrandr --verbose

drm_kms_helper.edid_firmware=DP-4:edid/1920x1080.bin

Where did you get that deprecated stanza?
Does /sys/class/drm/card0-DP-4/edid show the custom edid?
nb. that according to your journal nvidia loads before the root switch, ie. from the initramfs.
You'll have to add the edid to the initramfs files as well!

How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

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#5 2025-02-23 09:39:29

cakehunter
Member
Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

Is DP-4 actually the internal panel of a notebook?

It is DP-4 when in discrete mode, eDP-1 when in hybrid mode.

My internal display is wired to amd igpu and my hdmi output is wired to nvidia dgpu.
I think nvidia card uses a virtual display port when in discrete mode

You do understand that you're most likely micro-optimizing one problem while wasting heaps of battery somewhere else?

You are right, but until now I always had my external monitor plugged in, which makes system run reverse prime(since external monitor is wired to dgpu) instead of normal prime when I use hybrid mode. This I think is non different from discrete mode because in both the modes, nvidia gpu is rendering the output and the igpu just forwards the rendered frames to the internal display. So I thought it would be better to use discrete mode since I can save a bit of ram too that is shared to my igpu.

. . . wasting heaps of battery somewhere else?

since I had reverse prime I thought battery usage would be same. But since my new semester is starting, I realized hybrid mode would be better because I will not have my external monitor and the system will use Prime and actually save battery.(also accounting to my failure to lower the internal display refresh rate in discrete mode T-T ).


So after I changed to hybrid mode, there are a few new problems

  • When I try to turn off the internal display using xrandr (eg: when lid is closed)

     xrandr --output eDP-1 --off

    my external display freezes. I have to unplug and plug in the hdmi cable . Then both the displays start to work.


  • running the command 

    __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxgears

    opens the gears window in my external monitor and it lags severely. 

    ❯ __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
4 frames in 8.2 seconds =  0.488 FPS
3 frames in 8.9 seconds =  0.337 FPS
X connection to :0.0 broken (explicit kill or server shutdown).

    but if i move the window over to my internal monitor it runs smoothly.

    ❯ __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
487 frames in 5.0 seconds = 97.374 FPS
825 frames in 5.0 seconds = 164.983 FPS
826 frames in 5.0 seconds = 164.974 FPS
826 frames in 5.0 seconds = 165.053 FPS
825 frames in 5.0 seconds = 164.980 FPS
826 frames in 5.0 seconds = 165.025 FPS
X connection to :0.0 broken (explicit kill or server shutdown).

    however, if i change the refresh rate of my internal monitor to 60hz, then it lags the same as in the external monitor.

xorg log : http://0x0.st/8TVk.txt (at the end i turned of my eDP-1 and had to replug the hdmi cable)
journalctl -b : http://0x0.st/8TVd.txt

xrandr --verbose:

❯ xrandr --verbose
Screen 0: minimum 320 x 200, current 3840 x 1092, maximum 16384 x 16384
eDP-1 connected 1920x1080+1920+12 (0x54) normal (normal left inverted right x axis y axis) 344mm x 194mm
	Identifier: 0x52
	Timestamp:  373992
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       1
	CRTCs:      1 2 3 4
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	EDID: 
		00ffffffffffff0009e5980900000000
		221e0104b52213780754a5a7544c9b26
		0f505400000001010101010101010101
		010101010101b99c80a0703859403020
		360058c21000001a000000fd003ca5c1
		c128010a202020202020000000fe0042
		4f452043510a202020202020000000fe
		004e5631353646484d2d4e59380a00b1
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 	1.000000 0.000000 0.000000
		0.000000 1.000000 0.000000
		0.000000 0.000000 1.000000
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	vrr_capable: 1 
		range: (0, 1)
	Colorspace: Default 
		supported: Default, BT709_YCC, opRGB, BT2020_RGB, BT2020_YCC
	max bpc: 16 
		range: (8, 16)
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 87 
		supported: 87
	non-desktop: 0 
		range: (0, 1)
  1920x1080 (0x54) 401.210MHz +HSync -VSync *current +preferred
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height 1080 start 1083 end 1089 total 1169           clock 165.00Hz
  1680x1050 (0x55) 401.210MHz +HSync -VSync
        h: width  1680 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height 1050 start 1083 end 1089 total 1169           clock 165.00Hz
  1280x1024 (0x56) 401.210MHz +HSync -VSync
        h: width  1280 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height 1024 start 1083 end 1089 total 1169           clock 165.00Hz
  1440x900 (0x57) 401.210MHz +HSync -VSync
        h: width  1440 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height  900 start 1083 end 1089 total 1169           clock 165.00Hz
  1280x800 (0x58) 401.210MHz +HSync -VSync
        h: width  1280 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height  800 start 1083 end 1089 total 1169           clock 165.00Hz
  1280x720 (0x59) 401.210MHz +HSync -VSync
        h: width  1280 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height  720 start 1083 end 1089 total 1169           clock 165.00Hz
  1024x768 (0x5a) 401.210MHz +HSync -VSync
        h: width  1024 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height  768 start 1083 end 1089 total 1169           clock 165.00Hz
  800x600 (0x5b) 401.210MHz +HSync -VSync
        h: width   800 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height  600 start 1083 end 1089 total 1169           clock 165.00Hz
  640x480 (0x5c) 401.210MHz +HSync -VSync
        h: width   640 start 1968 end 2000 total 2080 skew    0 clock 192.89KHz
        v: height  480 start 1083 end 1089 total 1169           clock 165.00Hz
DP-1-0 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x1f9
	Timestamp:  373992
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 5 6 7
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	PRIME Synchronization: 1 
		supported: 0, 1
	CTM: 	1.000000 0.000000 0.000000
		0.000000 1.000000 0.000000
		0.000000 0.000000 1.000000
	CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0 
	BorderDimensions: 4 
		supported: 4
	Border: 0 0 0 0 
		range: (0, 65535)
	SignalFormat: DisplayPort 
		supported: DisplayPort
	ConnectorType: DisplayPort 
	ConnectorNumber: 1 
	_ConnectorLocation: 1 
	non-desktop: 0 
		supported: 0, 1
DP-1-1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x1fa
	Timestamp:  373992
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 5 6 7
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	PRIME Synchronization: 1 
		supported: 0, 1
	CTM: 	1.000000 0.000000 0.000000
		0.000000 1.000000 0.000000
		0.000000 0.000000 1.000000
	CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0 
	BorderDimensions: 4 
		supported: 4
	Border: 0 0 0 0 
		range: (0, 65535)
	SignalFormat: TMDS 
		supported: TMDS
	ConnectorType: DisplayPort 
	ConnectorNumber: 1 
	_ConnectorLocation: 1 
	non-desktop: 0 
		supported: 0, 1
DP-1-2 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x1fb
	Timestamp:  373992
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 5 6 7
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	PRIME Synchronization: 1 
		supported: 0, 1
	CTM: 	1.000000 0.000000 0.000000
		0.000000 1.000000 0.000000
		0.000000 0.000000 1.000000
	CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0 
	BorderDimensions: 4 
		supported: 4
	Border: 0 0 0 0 
		range: (0, 65535)
	SignalFormat: DisplayPort 
		supported: DisplayPort
	ConnectorType: DisplayPort 
	ConnectorNumber: 2 
	_ConnectorLocation: 2 
	non-desktop: 0 
		supported: 0, 1
DP-1-3 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x1fc
	Timestamp:  373992
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 5 6 7
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	PRIME Synchronization: 1 
		supported: 0, 1
	CTM: 	1.000000 0.000000 0.000000
		0.000000 1.000000 0.000000
		0.000000 0.000000 1.000000
	CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0 
	BorderDimensions: 4 
		supported: 4
	Border: 0 0 0 0 
		range: (0, 65535)
	SignalFormat: TMDS 
		supported: TMDS
	ConnectorType: DisplayPort 
	ConnectorNumber: 2 
	_ConnectorLocation: 2 
	non-desktop: 0 
		supported: 0, 1
HDMI-1-0 connected primary 1920x1080+0+0 (0x1ff) normal (normal left inverted right x axis y axis) 531mm x 298mm
	Identifier: 0x1fd
	Timestamp:  373992
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       0
	CRTCs:      0 5 6 7
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	EDID: 
		00ffffffffffff001e6d725bd7640900
		091e010380351e78eaa435a5544f9e27
		125054a54b80317c4568457c617c8168
		818081bc953c023a801871382d40582c
		4500132a2100001e8048801871382d40
		582c4500132a2100001e000000fd0038
		901ea021000a202020202020000000fc
		003234474c363030460a20202020015a
		02031ef1230907074b01020304111213
		1f903f408301000065030c001000fc7e
		80887038124018203500132a2100001e
		866f80a07038404030203500132a2100
		001efe5b80a07038354030203500132a
		21000018000000ff003030394e545653
		4a333633390a00000000000000000000
		000000000000000000000000000000b1
	PRIME Synchronization: 0 
		supported: 0, 1
	CTM: 	1.000000 0.000000 0.000000
		0.000000 1.000000 0.000000
		0.000000 0.000000 1.000000
	CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0 
	BorderDimensions: 4 
		supported: 4
	Border: 0 0 0 0 
		range: (0, 65535)
	SignalFormat: TMDS 
		supported: TMDS
	ConnectorType: HDMI 
	ConnectorNumber: 3 
	_ConnectorLocation: 3 
	non-desktop: 0 
		supported: 0, 1
  1920x1080 (0x1fe) 148.500MHz +HSync +VSync +preferred
        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 (0x1ff) 325.080MHz +HSync +VSync *current
        h: width  1920 start 1944 end 1976 total 2056 skew    0 clock 158.11KHz
        v: height 1080 start 1083 end 1088 total 1098           clock 144.00Hz
  1920x1080 (0x200) 285.500MHz +HSync +VSync
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock 137.26KHz
        v: height 1080 start 1083 end 1088 total 1144           clock 119.98Hz
  1920x1080 (0x201) 296.700MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock 134.86KHz
        v: height 1080 start 1084 end 1089 total 1125           clock 119.88Hz
  1920x1080 (0x202) 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 (0x203) 235.500MHz -HSync -VSync
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock 113.22KHz
        v: height 1080 start 1083 end 1088 total 1133           clock  99.93Hz
  1920x1080 (0x204) 185.600MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  84.36KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  74.99Hz
  1920x1080 (0x205) 148.350MHz +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 (0x206) 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
  1440x900 (0x207) 182.750MHz +HSync -VSync
        h: width  1440 start 1488 end 1520 total 1600 skew    0 clock 114.22KHz
        v: height  900 start  903 end  909 total  953           clock 119.85Hz
  1280x1024 (0x208) 187.250MHz +HSync -VSync
        h: width  1280 start 1328 end 1360 total 1440 skew    0 clock 130.03KHz
        v: height 1024 start 1027 end 1034 total 1084           clock 119.96Hz
  1280x1024 (0x209) 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 (0x20a) 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
  1280x960 (0x20b) 178.990MHz -HSync +VSync
        h: width  1280 start 1376 end 1520 total 1760 skew    0 clock 101.70KHz
        v: height  960 start  961 end  964 total 1017           clock 100.00Hz
  1280x720 (0x20c) 74.180MHz +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
  1280x720 (0x20d) 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
  1024x768 (0x20e) 115.500MHz +HSync -VSync
        h: width  1024 start 1072 end 1104 total 1184 skew    0 clock  97.55KHz
        v: height  768 start  771 end  775 total  813           clock 119.99Hz
  1024x768 (0x20f) 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 (0x210) 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 (0x211) 73.250MHz +HSync -VSync
        h: width   800 start  848 end  880 total  960 skew    0 clock  76.30KHz
        v: height  600 start  603 end  607 total  636           clock 119.97Hz
  800x600 (0x212) 68.180MHz -HSync +VSync
        h: width   800 start  848 end  936 total 1072 skew    0 clock  63.60KHz
        v: height  600 start  601 end  604 total  636           clock 100.00Hz
  800x600 (0x213) 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 (0x214) 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 (0x215) 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 (0x216) 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 (0x217) 52.410MHz -HSync +VSync
        h: width   640 start  680 end  744 total  848 skew    0 clock  61.80KHz
        v: height  480 start  481 end  484 total  515           clock 120.01Hz
  640x480 (0x218) 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 (0x219) 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
  640x480 (0x21a) 25.170MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.46KHz
        v: height  480 start  490 end  492 total  525           clock  59.93Hz
DP-1-4 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x21b
	Timestamp:  373992
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 5 6 7
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	PRIME Synchronization: 1 
		supported: 0, 1
	CTM: 	1.000000 0.000000 0.000000
		0.000000 1.000000 0.000000
		0.000000 0.000000 1.000000
	CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0 
	BorderDimensions: 4 
		supported: 4
	Border: 0 0 0 0 
		range: (0, 65535)
	SignalFormat: DisplayPort 
		supported: DisplayPort
	ConnectorType: Panel 
	ConnectorNumber: 0 
	_ConnectorLocation: 0 
	non-desktop: 0 
		supported: 0, 1





EDIT:


so i found out i'm wrong about the reverse prime rendering, the igpu is rendering and sending it to dgpu and is then passed to external monitor.
because 

❯ glxinfo | grep "OpenGL renderer"
OpenGL renderer string: AMD Radeon Graphics (radeonsi, renoir, LLVM 19.1.7, DRM 3.60, 6.13.3-arch1-1)

I also found the problem with having xf86-video-amdgpu and nvidia drivers . So i removed xf86-video-amdgpu.

but the issues in the list above still persist. ie: external monitor freezing and glxgears lagging in external monitor.

xorg log: http://0x0.st/8T4P.txt
journalctl-b: http://0x0.st/8T4Z.txt
xrandr --verbose: http://0x0.st/8T4N.txt

Last edited by cakehunter (2025-02-23 12:46:06)

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#6 2025-02-23 16:28:15

seth
Member
From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 74,307

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

since I had reverse prime I thought battery usage would be same.

No entirely, rendering on the GPU draws more power than just using it as VGA hub, but keeping both active instead of only the GPU might eat that.
You'll have to test and measure the actual demand for your usage profile.

https://wiki.archlinux.org/title/PRIME#Reverse_PRIME
https://wiki.archlinux.org/title/PRIME# … ronization

First off all drop xf86-video-amdgpu, then report back w/ the status quo.

Fwwi, the eDP only lists 165Hz modes and they're 

vrr_capable: 1

what means you (alternatively) likely want to enable AsyncFlipSecondaries, https://wiki.archlinux.org/title/Variab … figuration - not sure how you're currently running the output at a lower rate?

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#7 2025-02-23 17:27:09

cakehunter
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Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

First off all drop xf86-video-amdgpu

I have removed it...

I also found the problem with having xf86-video-amdgpu and nvidia drivers . So i removed xf86-video-amdgpu.

not sure how you're currently running the output at a lower rate?

lower rates are already available in xrandr:

❯ xrandr
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
eDP-2 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080    165.00 +  60.01    59.97    59.96    59.93* 
   1680x1050    165.00    59.95    59.88  
   1400x1050     74.76    59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024    165.00    85.02    75.02    60.02  
   1440x900     165.00  
   1400x900      59.96    59.88  
   1280x960      85.00    60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1280x800     165.00    59.99    59.97    59.81    59.91  
   1152x864      75.00  
   1280x720     165.00    60.00    59.99    59.86    59.74  
   1024x768     165.00    85.00    75.05    60.04    85.00    75.03    70.07    60.00  
   1024x768i     86.96  
   960x720       85.00    75.00    60.00  
   928x696       75.00    60.05  
   896x672       75.05    60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   832x624       74.55  
   960x540       59.96    59.99    59.63    59.82  
   800x600      165.00    85.00    75.00    70.00    65.00    60.00    85.14    72.19    75.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   700x525       74.76    59.98  
   800x450       59.95    59.82  
   640x512       85.02    75.02    60.02  
   700x450       59.96    59.88  
   640x480      165.00    85.09    60.00    85.01    72.81    75.00    59.94  
   720x405       59.51    58.99  
   720x400       85.04  
   684x384       59.88    59.85  
   640x400       59.88    59.98    85.08  
   576x432       75.00  
   640x360       59.86    59.83    59.84    59.32  
   640x350       85.08  
   512x384       85.00    75.03    70.07    60.00  
   512x384i      87.06  
   512x288       60.00    59.92  
   416x312       74.66  
   480x270       59.63    59.82  
   400x300       85.27    72.19    75.12    60.32    56.34  
   432x243       59.92    59.57  
   320x240       85.18    72.81    75.00    60.05  
   360x202       59.51    59.13  
   360x200       85.04  
   320x200       85.27  
   320x180       59.84    59.32  
   320x175       85.27  
DP-1-0 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 disconnected (normal left inverted right x axis y axis)
HDMI-1-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 298mm
   1920x1080     60.00*+ 144.00   119.98   119.88   100.00    99.93    74.99    59.94    50.00  
   1440x900     119.85  
   1280x1024    119.96    75.02    60.02  
   1280x960     100.00  
   1280x720      59.94    50.00  
   1024x768     119.99    75.03    60.00  
   800x600      119.97   100.00    75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480      120.01    75.00    59.94    59.93  
DP-1-4 disconnected (normal left inverted right x axis y axis)
  1280x1024 (0x54) 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 (0x55) 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
  1024x768 (0x6f) 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 (0x71) 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 (0x8d) 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 (0x8e) 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
  640x480 (0xa2) 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 (0xa3) 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

the only major problem I'm facing now is my external monitor freezing when i turn off the internal monitor using xrandr:

 xrandr --output eDP-2  --off

I get a black screen with a movable cursor on the external monitor, but cannot interact with anything until unplugging the HDMI cable.

and a minor problem is that glxgear when run with __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxgears  on external monitor lags a lot.(doesn't run)

Last edited by cakehunter (2025-02-23 18:32:30)

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#8 2025-02-23 18:09:33

cakehunter
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Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

I think the problem is at [   119.002] (II) NVIDIA(G0): Setting mode "NULL"
xorg log: https://0x0.st/8Twc.txt

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#9 2025-02-23 21:19:33

seth
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From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 74,307

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

No, that's rather normal.

I get a black screen with a movable cursor on the external monitor

Are you running a composited session (picom, gnome, …)?
Which?

glxgears  on external monitor lags a lot

See the first link in #6, try

__GL_SYNC_TO_VBLANK=0 prime-run glxgears
LIBGL_DRI3_DISABLE=true prime-run glxgears

And a mentioned enable AsyncFlipSecondaries
/etc/X11/xorg.conf.d/20-flipflop.conf

Section "Device"
    Identifier "APU"
    Driver  "modesetting"
    Option "AsyncFlipSecondaries" "True"
EndSection

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#10 2025-02-24 10:26:28

cakehunter
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Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

Are you running a composited session (picom, gnome, …)?

xfwm4 (xfce desktop)

__GL_SYNC_TO_VBLANK=0 prime-run glxgears
LIBGL_DRI3_DISABLE=true prime-run glxgears

Both gave the same result.

And a mentioned enable AsyncFlipSecondaries
/etc/X11/xorg.conf.d/20-flipflop.conf

Section "Device"
    Identifier "APU"
    Driver  "modesetting"
    Option "AsyncFlipSecondaries" "True"
EndSection

the system doesn't boot after adding this. Had to boot into recovery and remove it to get system functioning.

journalctl -b -2 : http://0x0.st/8Ame.txt
journalctl -b: http://0x0.st/8Am2.txt

Last edited by cakehunter (2025-02-24 10:27:39)

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#11 2025-02-24 15:32:04

seth
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From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 74,307

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

Disable https://wiki.archlinux.org/title/Xfwm#Composite_manager

the system doesn't boot after adding this.

I'm failry sure the system boots, see the 2nd link below on how to not boot into the GUI mode.
Do you have the xorg log for that configuration failing?

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#12 2025-02-24 18:08:05

cakehunter
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Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

This worked! thanks!


after adding /etc/X11/xorg.conf.d/20-flipflop.conf
xorg log of failed configuration: https://0x0.st/8AQP.txt

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#13 2025-02-24 18:54:16

cakehunter
Member
Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

Fixed the issue by adding busid of the igpu!
Thanks..!

the glxgears still dont run on external monitor..

❯ __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
11070 frames in 5.0 seconds = 2213.765 FPS
5150 frames in 5.0 seconds = 1029.864 FPS
4097 frames in 5.0 seconds = 819.396 FPS
2343 frames in 5.0 seconds = 468.577 FPS
7402 frames in 5.0 seconds = 1480.171 FPS
4682 frames in 5.0 seconds = 936.236 FPS
3673 frames in 5.0 seconds = 734.466 FPS
3027 frames in 5.0 seconds = 605.259 FPS
X connection to :0.0 broken (explicit kill or server shutdown).

it does run smoothly on the laptop display...
Applications like discord and spotify become unresponsive and laggy for first 20 seconds after opening.. Is that normal?

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#14 2025-02-24 19:30:46

cakehunter
Member
Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

Other applications like Zoom, blender-benchmark, teams-for-linux, stremio,  etc lag heavily like glxgears. I have to bring these windows into the internal display to get them working. As soon as i move the window over to the external display, they become unresponsive and I have to close them...

when my move the window in the external display it becomes something like this : https://imgur.com/a/6tdIkLv

Last edited by cakehunter (2025-02-24 19:35:06)

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#15 2025-02-24 23:08:51

seth
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From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 74,307

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

Is prime sync still off?

	PRIME Synchronization: 0 
		supported: 0, 1

https://wiki.archlinux.org/title/PRIME# … ronization

Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
11070 frames in 5.0 seconds = 2213.765 FPS

So this seems to flip the external display asynchronously (and vsync blanking isn't a thing)
glxgears should™ update at some hundred fps, but isn't?
And you also didn't re-enable the compositor?

Have you tried "__GL_SYNC_TO_VBLANK=0 LIBGL_DRI3_DISABLE=true" with the current setup?

Do you prime-run the other clients as well or are they running on the APU?

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#16 2025-02-25 14:05:09

cakehunter
Member
Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

LIBGL_DRI3_DISABLE=true

solves everything!
Thanks

But when i do it with prime-run

 LIBGL_DRI3_DISABLE=true prime-run glxgears

it glitches out.

But I can live that.
Thank you for the help!

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#17 2025-02-25 15:13:46

seth
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Registered: 2012-09-03
Posts: 74,307

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

glitches out like https://imgur.com/a/6tdIkLv ?

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#18 2025-02-25 18:12:40

cakehunter
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Registered: 2024-04-05
Posts: 16

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

yes, like that everytime on external monitor.

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#19 2025-02-25 20:34:57

seth
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Registered: 2012-09-03
Posts: 74,307

Re: [SOLVED]Need a lower refresh rate on my laptop's monitor

How's the behavior if you re-enable the compositor (or use eg. picom instead)?

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