I am trying to configure my laptop with hybrid graphics and external monitor setup. I have installed the latest nvidia-470 driver on Ubuntu. I have read the Arch section for NVidia
https://wiki.archlinux.org/title/NVIDIA_Optimus
and since I have the laptop plugged all the time, I don’t care for power saving features. Thus I chose “Use NVidia graphics only”. I used the following xorg configuration
Section "OutputClass"
Identifier "intel"
MatchDriver "i915"
Driver "modesetting"
EndSection
Section "OutputClass"
Identifier "nvidia"
MatchDriver "nvidia-drm"
Driver "nvidia"
Option "AllowEmptyInitialConfiguration"
Option "PrimaryGPU" "yes"
Option "metamodes" " DP-0.1: nvidia-auto-select +1680+0 {ForceCompositionPipeline=On}, DP-0.3: nvidia-auto-select +0+390 {ForceCompositionPipeline=On} "
ModulePath "/usr/lib/nvidia/xorg"
ModulePath "/usr/lib/xorg/modules"
EndSection
and set the required ~/.xinitrc
xrandr --setprovideroutputsource modesetting NVIDIA-0
xrandr --auto
as well as the kernel mode setting in /etc/default/grub
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash "
GRUB_CMDLINE_LINUX="nvidia-drm.modeset=1"
With the ForceCompositionPipeline option vertical sync works on the external monitors connected via the Display port, but not on the laptop screen (or PRIME display), although the drm setting is set. When I run ``xrandr --verbose | grep PRIME, I get
PRIME Synchronization: 0
so apparently PRIME sync is turned off. If I could choose, I would want the laptop screen to be rendered by the iGPU and the external monitors by the dGPU. Is that possible?