- My ultimate goal (not the question here, just for context): I want to run LXC GUI containers from the command line, display each one on a different monitor attached to my GT710. I want to share a keyboard and mouse between the monitors, but I will never move windows between them.
- What I think I need to do: I think I need to set up multiple X screens so that I can start a container with
DISPLAY=:0.0,DISPLAY=:0.1, orDISPLAY=:0.2. In order to do that, I think I need to create multiple screen, device, and monitor sections in xorg.conf. I might or might not need to useZaphoHeads. I’m fairly sure thatTwinViewis not what I want. - My attempts with
xorg.conf:
I’ve tried so many things that I am not sure which version of myxorg.confwould be most relevant, so I will just give the most recent one:
ection "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" rightOf "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" "DVI"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
Screen 0
VendorName "NVIDIA Corporation"
Option "ZaphodHeads" "Monitor0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
EndSubSection
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Unknown"
ModelName "Unknown"
Option "DPMS" "HDMI"
EndSection
Section "Device"
Identifier "Device1"
Driver "nvidia"
Screen 1
VendorName "NVIDIA Corporation"
Option "ZaphodHeads" "Monitor1"
EndSection
Section "Screen"
Identifier "Screen1"
Device "Device1"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Depth 24
EndSubSection
EndSection
Although I have a second HDMI monitor attached, it does not show in xrandr with this configuration. However with X started, I can move my cursor between monitors, so X is seeing the HDMI monitor somehow.
~$ sudo xrandr -q
Screen 0: minimum 8 x 8, current 1600 x 1200, maximum 16384 x 16384
VGA-0 disconnected primary (normal left inverted right x axis y axis)
DVI-D-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm x 275mm
1600x1200 60.00*+
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
If I remove the ServerLayout section, xrandr can get info for both monitors:
Screen 0: minimum 8 x 8, current 4160 x 1440, maximum 16384 x 16384
VGA-0 disconnected primary (normal left inverted right x axis y axis)
DVI-D-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 367mm x 275mm
1600x1200 60.00*+
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
HDMI-0 connected 2560x1440+1600+0 (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440 59.95*+
2048x1152 60.00
1920x1440 60.00
1920x1200 59.88
1920x1080 60.00 59.94 50.00 60.05 60.00 50.04
1680x1050 59.95
1440x900 59.89
1440x576 50.00
1440x480 59.94
1280x1024 75.02 60.02
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
If I specify the PCI BusID with BusID "PCI:44:0:0" under the Device entries, X cannot start:
[ 44357.124] (WW) xf86OpenConsole: setpgid failed: Operation not permitted
[ 44357.124] (WW) xf86OpenConsole: setsid failed: Operation not permitted
[ 44357.125] (WW) Falling back to old probe method for modesetting
[ 44357.125] (WW) Falling back to old probe method for fbdev
[ 44357.125] (WW) Falling back to old probe method for modesetting
[ 44357.125] (WW) Falling back to old probe method for fbdev
[ 44357.125] (EE) No devices detected.
[ 44357.125] (EE)
Fatal server error:
[ 44357.125] (EE) no screens found(EE)
I’ve looked at a bunch of documentation, but am still confused. These include:
http://http.download.nvidia.com/XFree86/Linux-x86_64/470.82.01/README/configmultxscreens.html
https://nvidia.custhelp.com/app/answers/detail/a_id/176/~/linux---configuring-multiple-x-screens-on-one-card
https://www.x.org/archive/X11R6.9.0/doc/html/xorg.conf.5.htm
Also, my driver info:
nvidia-smi
Tue Nov 23 01:26:12 2021
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 470.82.01 Driver Version: 470.82.01 CUDA Version: 11.4 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 NVIDIA GeForce ... Off | 00000000:44:00.0 N/A | N/A |
| 40% 38C P0 N/A / N/A | 0MiB / 973MiB | N/A Default |
| | | N/A |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| No running processes found |
+-----------------------------------------------------------------------------+