Arch Linux

xfox360

Member

Registered: 2022-10-03

Posts: 1

Dual GPU + 3 monitors, 1 stuck at GRUB

Hey everyone.
I installed a second GPU recently, because my main one does not support VGA.

But when i connected the 3rd monitor to said GPU via VGA, it does nothing.
It simply displays the GRUB welcome message and does so even while I am writing these lines. The other 2 monitors which are connected to the main GPU via DisplayPort are behaving just fine.

"xrandr --listproviders" gives me the following output:

Providers: number : 1
Provider 0: id: 0x1b7 cap: 0x1, Source Output crtcs: 4 outputs: 7 associated providers: 0 name:NVIDIA-0

whereas "lspci | grep "VGA"" gives me this:

04:00.0 VGA compatible controller: NVIDIA Corporation GK208B [GeForce GT 710] (rev a1)
07:00.0 VGA compatible controller: NVIDIA Corporation TU106 [GeForce RTX 2060 Rev. A] (rev a1)

The OS clearly detects the second GPU, but I can't find it anywhere else. My POST-Screen and GRUB seem to use it, but after that it does nothing at all. 
Yes, I tried rummaging the internet but only found people having issues with virtualisation and pass-throughs or people using laptop GPUs, but nothing that seemed familiar to my problem.
I updated the whole system and tried rebooting, nothing does.

xrandr also does not detect the ports that should be on the second GPU:

Screen 0: minimum 8 x 8, current 6400 x 1680, maximum 32767 x 32767
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary 2560x1440+1920+240 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     74.92*+  59.95
   1920x1080     60.00    59.94    50.00
   1680x1050     59.95
   1440x900      59.89
   1440x576      50.00
   1440x480      59.94
   1280x1024     75.02    60.02
   1280x960      60.00
   1280x800      59.81
   1280x720      60.00    59.94    50.00
   1152x864      75.00
   1024x768      75.03    70.07    60.00
   800x600       75.00    72.19    60.32    56.25
   720x576       50.00
   720x480       59.94
   640x480       75.00    59.94    59.93
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 connected 1920x1080+4480+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080     60.00*+  74.97    59.94    50.00
   1680x1050     59.95
   1440x900      59.89
   1280x1024     75.02    60.02
   1280x960      60.00
   1280x720      60.00    59.94    50.00
   1024x768      75.03    70.07    60.00
   800x600       75.00    72.19    60.32    56.25
   720x576       50.00
   720x480       59.94
   640x480       75.00    72.81    59.94    59.93
DP-5 disconnected (normal left inverted right x axis y axis)

I am using the proprietary nVidia-driver, but am not sure if i need an additional driver for the older GPU, since they dropped support for the 9xx lineup some time ago and this device is a GT 710.

Additional information:

OS: Arch Linux x86_64
Kernel: 5.19.12-arch1-1
Uptime: 42 mins
Packages: 1430 (pacman)
Shell: zsh 5.9
Resolution: 2560x1440, 1920x1080
DE: i3-with-shmlog
WM: i3
CPU: AMD Ryzen 5 3600 (12) @ 4.400GHz
GPU: NVIDIA GeForce RTX 2060 Rev. A
GPU: NVIDIA GeForce GT 710
Memory: 1938MiB / 31978MiB

Last edited by xfox360 (2022-10-03 21:39:12)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,263

Re: Dual GPU + 3 monitors, 1 stuck at GRUB

Kepler is a legacy architecture only supported by the 470xx driver so you can't get both of them working at the same time with the latest driver.  You can try the 470xx driver but it will lack a lot of features that have come with the new driver. I'd say your general best bet is to get a HDMI-VGA converter/different monitor/cable if possible.