Nvidia-xrun

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Nvidia-xrun is a utility to allow Nvidia optimus enabled laptops run X server with discrete nvidia graphics on demand. This solution offers full GPU utilization, compatibility and better performance than Bumblebee.

X server can only be used with integrated graphics or discrete Nvidia graphics, but not both, so user might want to switch to separate virtual console and start another X server using different graphics from what was used for the first X server.

Installation

Tango-view-refresh-red.pngThis article or section is out of date.Tango-view-refresh-red.png

Reason: As of nvidia-xrun release 0.4, the PM fork has been merged and bbswitch is no longer used. There may be changes to AUR packages and bbswitch configuration (Discuss in Talk:Nvidia-xrun#)

Install:

Configuration

Setting the right bus id

Note: If you installed package from AUR, the bus id has been automatically set in /etc/X11/nvidia-xorg.conf. Make sure the bus ID has been correctly set, otherwise change it (you can find correct bus ID using lspci command). In some cases you need to convert the hex output from lspci to decimal for nvidia-xorg.conf, e.g. 3b:00.0 becomes "PCI:59:0:0"

Find your display device bus id:

 $ lspci | grep -i nvidia | awk '{print $1}'

It might return something similar to 01:00.0. Then create a file (for example /etc/X11/nvidia-xorg.conf.d/30-nvidia.conf) to set the proper bus id:

/etc/X11/nvidia-xorg.conf.d/30-nvidia.conf
Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "PCI:1:0:0"
EndSection

Also this way you can adjust some nvidia settings if you encounter issues:

/etc/X11/nvidia-xorg.conf.d/30-nvidia.conf
Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    #  Option "AllowEmptyInitialConfiguration" "Yes"
    #  Option "UseDisplayDevice" "none"
EndSection

Automatically run window manager

For convenience you can create an ~/.nvidia-xinitrc file with your favourite window manager.

if [ $# -gt 0 ]; then
  $*
else
  openbox-session
  # Alternatively, you can also use xfce4:
  # xfce4-session
fi

With it you do not need to specify the app and can simply execute:

$ nvidia-xrun

Use bbswitch to manage nvidia

When the nvidia card is not needed, bbswitch can be used to turn it off. The nvidia-xrun script will automatically take care of running a window manager and waking up the nvidia card. To achieve that, you need to:

  • Load bbswitch module on boot
 # echo 'bbswitch ' > /etc/modules-load.d/bbswitch.conf
  • Disable the nvidia module on boot:
 # echo 'options bbswitch load_state=0 unload_state=1' > /etc/modprobe.d/bbswitch.conf 

After a reboot, the nvidia card will be off. This can be seen by querying bbswitch's status:

 $ cat /proc/acpi/bbswitch  

To force the card to turn on/off respectively run:

 # tee /proc/acpi/bbswitch <<<OFF
 # tee /proc/acpi/bbswitch <<<ON

For more about bbswitch see Bumblebee-Project/bbswitch.

Usage

Once the system boots, from the virtual console, login to your user, and run nvidia-xrun <application>.

If above does not work, switch to unused virtual console and try again.

As mentioned before, running apps directly with nvidia-xrun <application> does not work well, so it is best to create an ~/.nvidia-xinitrc as outlined earlier, and use nvidia-xrun to launch your window manager.

Troubleshooting

NVIDIA GPU fails to switch off or is set to be default

See #Use bbswitch to manage nvidia.

If Nvidia GPU still fails to switch off, or is somehow set to be default whenever you use or not nvidia-xrun, then you might likely need to blacklist specific modules (which were previously blacklisted by Bumblebee). Create this file and restart your system:

/usr/lib/modprobe.d/nvidia-xrun.conf
blacklist nvidia
blacklist nvidia-drm
blacklist nvidia-modeset
blacklist nvidia-uvm
blacklist nouveau

Make sure DRM kernel mode setting is disabled see NVIDIA#DRM kernel mode setting