[OT]Dual GPU - help on the way

From: Per olof Ljungmark <peo_at_nethead.se>
Date: Fri, 02 Jul 2021 13:52:12 UTC 
Slightly frustrated I'm asking on this list.

The setup is HP Z620 with dual Nvidia K2000 and three monitors, the aim 
is to have the desktop (xfce4) extended to all three.

It should be doable with this setup but so far all efforts failed.

With a "standard" xorg.conf, I get the desktop on monitor 1 and 2, the 
third is a black screen but I can move the pointer into it.

Alternatively I could run another X session on X screen 1 instead of 
extending the desktop.

Help welcome!

Thank you in advance,
Per

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 460.56


Section "ServerLayout"
     Identifier     "Layout0"
     Screen      0  "Screen0" 0 0
     Screen      1  "Screen1" RightOf "Screen0"
     InputDevice    "Keyboard0" "CoreKeyboard"
     InputDevice    "Mouse0" "CorePointer"
     Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "Module"
     Load           "dbe"
     Load           "extmod"
     Load           "type1"
     Load           "freetype"
     Load           "glx"
EndSection

Section "InputDevice"

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

Section "InputDevice"

     # generated from default
     Identifier     "Keyboard0"
     Driver         "keyboard"
EndSection

Section "Monitor"

     # HorizSync source: edid, VertRefresh source: edid
     Identifier     "Monitor0"
     VendorName     "Unknown"
     ModelName      "Eizo CS2420"
     HorizSync       26.0 - 78.0
     VertRefresh     23.0 - 63.0
     Option         "DPMS"
EndSection

Section "Monitor"

     # HorizSync source: unknown, VertRefresh source: unknown
     Identifier     "Monitor1"
     VendorName     "Unknown"
     ModelName      "Eizo EV2416W"
     HorizSync       0.0 - 0.0
     VertRefresh     0.0
     Option         "DPMS"
EndSection

Section "Device"
     Identifier     "Device0"
     Driver         "nvidia"
     VendorName     "NVIDIA Corporation"
     BoardName      "Quadro K2000"
     BusID          "PCI:5:0:0"
EndSection

Section "Device"
     Identifier     "Device1"
     Driver         "nvidia"
     VendorName     "NVIDIA Corporation"
     BoardName      "Quadro K2000D"
     BusID          "PCI:4:0:0"
EndSection

Section "Screen"
     Identifier     "Screen0"
     Device         "Device0"
     Monitor        "Monitor0"
     DefaultDepth    24
     Option         "Stereo" "0"
     Option         "nvidiaXineramaInfoOrder" "DFP-3"
     Option         "metamodes" "DP-3: nvidia-auto-select +1920+0, DP-2: 
nvidia-auto-select +0+0"
     Option         "SLI" "Off"
     Option         "MultiGPU" "Off"
     Option         "BaseMosaic" "off"
     SubSection     "Display"
         Depth       24
     EndSubSection
EndSection

Section "Screen"
     Identifier     "Screen1"
     Device         "Device1"
     Monitor        "Monitor1"
     DefaultDepth    24
     Option         "Stereo" "0"
     Option         "metamodes" "nvidia-auto-select +0+0 {AllowGSYNC=Off}"
     Option         "SLI" "Off"
     Option         "MultiGPU" "Off"
     Option         "BaseMosaic" "off"
     SubSection     "Display"
         Depth       24
     EndSubSection
EndSection