Arch Linux

shini

Member

Registered: 2019-10-28

Posts: 3

Running multiple displays from multiple graphics cards

have two monitor that aren't connecting but they are connected to a different graphics card.
xrandr gives me :

 
Screen 0: minimum 8 x 8, current 5120 x 1440, 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)
HDMI-0 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)
DP-4 connected primary 5120x1440+0+0 (normal left inverted right x axis y axis) 1mm x 1mm
   3840x1080    119.97 +  99.96    59.97  
   5120x1440    119.97*  100.00    59.98  
   2560x1440     59.95  
   2560x1080    119.88   100.00    60.00    59.94  
   1920x1080    119.88   100.00    60.00    59.94  
   1680x1050     59.95  
   1600x900      60.00  
   1440x900      59.89  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      60.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32    56.25  
   640x480       75.00    72.81    59.94  
DP-5 disconnected (normal left inverted right x axis y axis)
USB-C-0 disconnected (normal left inverted right x axis y axis)
 

And nvidia-xconfig --query-gpu-info gives me:

 
  PCI BusID : PCI:1:0:0

  Number of Display Devices: 1

  Display Device 0 (TV-5):
      EDID Name             : Samsung C49RG9x
      Minimum HorizSync     : 30.000 kHz
      Maximum HorizSync     : 190.000 kHz
      Minimum VertRefresh   : 50 Hz
      Maximum VertRefresh   : 120 Hz
      Maximum PixelClock    : 970.000 MHz
      Maximum Width         : 5120 pixels
      Maximum Height        : 1440 pixels
      Preferred Width       : 3840 pixels
      Preferred Height      : 1080 pixels
      Preferred VertRefresh : 120 Hz
      Physical Width        : 1190 mm
      Physical Height       : 340 mm


GPU #1:
  Name      : GeForce GTX 970
  UUID      : GPU-07d78280-ba28-41ae-89d1-04a7aa82f787
  PCI BusID : PCI:2:0:0

  Number of Display Devices: 2
Number of GPUs: 2

GPU #0:
  Name      : GeForce RTX 2080
  UUID      : GPU-413834d0-83ef-88da-dca3-601816f5d395
  PCI BusID : PCI:1:0:0

  Number of Display Devices: 1

  Display Device 0 (TV-5):
      EDID Name             : Samsung C49RG9x
      Minimum HorizSync     : 30.000 kHz
      Maximum HorizSync     : 190.000 kHz
      Minimum VertRefresh   : 50 Hz
      Maximum VertRefresh   : 120 Hz
      Maximum PixelClock    : 970.000 MHz
      Maximum Width         : 5120 pixels
      Maximum Height        : 1440 pixels
      Preferred Width       : 3840 pixels
      Preferred Height      : 1080 pixels
      Preferred VertRefresh : 120 Hz
      Physical Width        : 1190 mm
      Physical Height       : 340 mm


GPU #1:
  Name      : GeForce GTX 970
  UUID      : GPU-07d78280-ba28-41ae-89d1-04a7aa82f787
  PCI BusID : PCI:2:0:0

  Number of Display Devices: 2

  Display Device 0 (TV-1):
      EDID Name             : SAMSUNG
      Minimum HorizSync     : 15.000 kHz
      Maximum HorizSync     : 81.000 kHz
      Minimum VertRefresh   : 24 Hz
      Maximum VertRefresh   : 75 Hz
      Maximum PixelClock    : 594.000 MHz
      Maximum Width         : 4096 pixels
      Maximum Height        : 2160 pixels
      Preferred Width       : 3840 pixels
      Preferred Height      : 2160 pixels
      Preferred VertRefresh : 30 Hz
      Physical Width        : 1070 mm
      Physical Height       : 600 mm

  Display Device 1 (TV-2):
      EDID Name             : AOC 2260WG5
      Minimum HorizSync     : 83.000 kHz
      Maximum HorizSync     : 83.000 kHz
      Minimum VertRefresh   : 48 Hz
      Maximum VertRefresh   : 76 Hz
      Maximum PixelClock    : 170.000 MHz
      Maximum Width         : 1920 pixels
      Maximum Height        : 1080 pixels
      Preferred Width       : 1920 pixels
      Preferred Height      : 1080 pixels
      Preferred VertRefresh : 60 Hz
      Physical Width        : 480 mm
      Physical Height       : 270 mm
 

So i can see they are being detected but I don't know how to enable them from xrandr as they don't show up. most resources about multi gpu multi monitor appear to be very old and I was wondering if there currently exists an easier way to it.

Last edited by shini (2019-10-31 18:01:07)

loqs

Member

Registered: 2014-03-06

Posts: 19,098

Re: Running multiple displays from multiple graphics cards

Welcome to the arch linux forums shini.  Please post the full contents of Xorg.n.log and any xorg configuration files you have created as well as the output of dmesg.
Also how is X started on the system?

shini

Member

Registered: 2019-10-28

Posts: 3

Re: Running multiple displays from multiple graphics cards

i originally didn't create any xorg files. but now i have run sudo xconfig giving me :

 # nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 435.21

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
Option "DPMS"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24SubSection "Display"
Depth 24
EndSubSection
EndSection
 

trying to see if i can twinview working from https://wiki.archlinux.org/index.php/NVIDIA.

as for the X started on the system I'm not sure. I think plasma kde as the desktop environment, if that helps. and thanks for the welcome

EDIT: nvm twinview is for a multiple monitors on one gpu

Last edited by shini (2019-10-31 18:49:27)

jasonwryan

Anarchist

From: .nz

Registered: 2009-05-09

Posts: 30,426

Website

Re: Running multiple displays from multiple graphics cards

Read the Code of Conduct and use code tags when pasting to the boards: https://wiki.archlinux.org/index.php/Co … s_and_code

And how can you not be sure how X is started? Did you not set this system up yourself?

Last edited by jasonwryan (2019-10-31 17:59:25)

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shini

Member

Registered: 2019-10-28

Posts: 3

Re: Running multiple displays from multiple graphics cards

thanks for the code of conduct link. i set it up myself a month or two ago, but kind of left this problem too long. I found out that the display manager I used was SDDM by basically running

 sudo systemctl disable "stuff" 

for all the different display managers. I'm sure there is a more elegant way to have figured it out.

Last edited by shini (2019-10-31 18:18:03)

loqs

Member

Registered: 2014-03-06

Posts: 19,098

Re: Running multiple displays from multiple graphics cards

systemctl list-unit-files --state=enabled

Will show services that were not enabled by default.

I would suggest removing the xorg.conf nvidia-xconfig generated restarting sddm then
posting the contents of xorg.0.log it can be found in either ~/.local/share/xorg/ or /var/log/ plus the output of the following:

lspci | grep -e VGA -e 3D
dmesg

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 78,267

Re: Running multiple displays from multiple graphics cards

You've two different GPUs - w/o SLI you can either run two separate X11 sceens or use xinerama (what kills xrandr support which some "modern" DEs and WMs rather blindly rely one)

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