I am running Debian 11 (Bullseye), displays are attached with MST (daisy-chained) over DP, mismatched resolutions, one landscape @ 2560 *1440 (main) and a portrait @ 1080*1920 (secondary). Nvidia drivers are version 470.141.03 as reported by the X server settings tool.
I have tried enabling the force full composition pipeline using this guide https://www.youtube.com/watch?v=oYWer86A20s
A DDG search yielded this,
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nvidia-settings --assign CurrentMetaMode="nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On }"
My current xorg.conf looks like this,
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# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 470.141.03
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
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/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "DELL P2717H"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 76.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "NVIDIA GeForce RTX 2060"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-2.8"
Option "metamodes" "DP-0.1: nvidia-auto-select +2560+0 {rotation=left, ForceCompositionPipeline=On, ForceFullCompositionPipeline=On}, DP-0.8: 2560x1440_60 +0+240"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
SubSection "Display"
Depth 24
EndSubSection
EndSection
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Screen 0: minimum 8 x 8, current 3640 x 1920, maximum 32767 x 32767
DP-0.8 connected primary 2560x1440+0+240 (normal left inverted right x axis y axis) 609mm x 349mm
2560x1440 59.95*+
1920x1080 60.00 59.94 50.00
1680x1050 59.95 59.88
1600x900 60.00
1440x900 59.90 59.89
1440x480 59.94
1366x768 59.79
1280x1024 60.02
1280x800 59.81
1280x720 60.00 59.94 50.00
1024x768 60.00
800x600 60.32
720x480 59.94
640x480 59.94 59.93
DP-0.1 connected 1080x1920+2560+0 left (normal left inverted right x axis y axis) 598mm x 336mm
1920x1080 60.00*+
1600x900 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
DVI-D-0 disconnected (normal left inverted right x axis y axis)
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)
HDMI-1 disconnected (normal left inverted right x axis y axis)