Arch Linux

patriacaelum

Member

Registered: 2022-08-25

Posts: 2

No display output on second monitor from second GPU

Hi, new to the forums because the wiki is great and didn't have problems for a few years.

I recently replaced the motherboard with two GPU slots, and I can't get any display output on the second monitor. I'm fairly certain the cables are fine because it worked fine when I was using only one GPU. I'm using i3wm.

This is the "xrandr" output. I don't understand why it shows the DVI port as connected with the right screen resolutions, but doesn't list it as an active monitor.

Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
DisplayPort-2 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 697mm x 392mm
   2560x1440    120.00*+ 164.96   120.01    96.02    72.01    60.01    50.01    48.01   143.97    59.95  
   1920x1200    120.00  
   1920x1080    120.00   119.88    60.00    60.00    50.00    59.94  
   1600x1200    120.00  
   1680x1050    120.00  
   1280x1024    120.00  
   1440x900     120.00  
   1280x800     120.00  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
DisplayPort-3 disconnected (normal left inverted right x axis y axis)
DisplayPort-4 disconnected (normal left inverted right x axis y axis)
HDMI-A-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-A-1-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-1-1 disconnected (normal left inverted right x axis y axis)
DVI-D-1-0 connected (normal left inverted right x axis y axis)
   1920x1200     59.95 +
   1920x1080     60.00  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     60.02  
   1440x900      59.95  
   1280x960      60.00  
   1280x800      59.95  
   1280x720      59.95  
   1024x768      60.00  
   800x600       60.32  
   640x480       59.94  
   720x400       70.08  
  1920x1080 (0x65) 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
  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 (0x72) 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 (0x77) 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

This is the output from "lspci | grep -e VGA -e 3D". I have the primary monitor attached to the RX 6600XT via displayport and the secondary monitor attached to the RX 580 via DVI.

03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7)
09:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 23 [Radeon RX 6600/6600 XT/6600M] (rev c1)

And the output from "journalctl -b": http://0x0.st/o96c.txt

Any help would greatly be appreciated.

seth

Member

Registered: 2012-09-03

Posts: 51,553

Re: No display output on second monitor from second GPU

xrandr --output DVI-D-1-0 --auto

Post your xorg log, Xorg should™ enable every available output when it starts, but because of the redirection, the output might be considered toolate™
In that case you can either enable and configure it's position w/ an xorg configlet or by just calling xrandr in your session scripts.
https://wiki.archlinux.org/title/Multih … _xorg.conf
The identifier need to match the xrandr output names and you may also need

Option	"Enable"	"True"

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patriacaelum

Member

Registered: 2022-08-25

Posts: 2

Re: No display output on second monitor from second GPU

This is the xorg log: http://0x0.st/o9IC.txt

Thanks, the "xrandr --output" command got the monitor to display something, and I managed to fiddle around with the settings, but it does reset after rebooting, so I'll look into integrating it into the xorg startup scripts.

Last edited by patriacaelum (2022-08-25 22:00:04)