gswitch

gautodetect

#! /bin/env fish

set NVIDIA_GPU_COUNT (/usr/sbin/lspci | grep -i nvidia | wc -l)

if test "$NVIDIA_GPU_COUNT" -gt 1
  echo "Setting graphics to eGPU"
  /usr/local/bin/gswitch egpu
else
  echo "Setting graphics to Intel"
  /usr/local/bin/gswitch internal-intel
end

gautodetect.service

[Unit]
Description=Automatic detection of hardware and XOrg config

[Service]
Type=oneshot
ExecStart=/usr/local/bin/gautodetect

[Install]
WantedBy=local-fs.target

gswitch

#!/bin/env fish

if test (whoami) != "root"
  echo "You need to be root."
  exit
end

set LINK_TARGET /etc/X11/xorg.conf
set INTERNAL_INTEL_XORG_CONF /etc/X11/xorg.internal.intel.conf
set INTERNAL_NVIDIA_XORG_CONF /etc/X11/xorg.internal.nvidia.conf
set EGPU_NVIDIA_XORG_CONF /etc/X11/xorg.egpu.nvidia.conf

switch  (echo $argv[1])
  case "egpu"
    rm -f $LINK_TARGET
    ln -s $EGPU_NVIDIA_XORG_CONF $LINK_TARGET
  case "internal-intel"
    rm -f $LINK_TARGET
    ln -s $INTERNAL_INTEL_XORG_CONF $LINK_TARGET
  case "internal-nvidia"
    rm -f $LINK_TARGET
    ln -s $INTERNAL_NVIDIA_XORG_CONF $LINK_TARGET
  case "*"
    echo "Unknown configuration $argv[1]. Valid options are 'egpu', 'internal-intel', 'internal-nvidia'"
    exit 1
end

exit 0

xorg.egpu.nvidia.conf

Section "Module"
    Load "modesetting"
EndSection

Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    BusID "PCI:7:0:0"
    Option "AllowEmptyInitialConfiguration"
    Option "AllowExternalGpus" "True"
EndSection

Section "Monitor"
    Identifier "HDMI-0"
    Option "Primary" "true"
EndSection

Section "Monitor"
    Identifier "eDP-1-1"
    Option "LeftOf" "HDMI-0"
EndSection

xorg.internal.intel.conf

# Intentionally empty

xorg.internal.nvidia.conf

Section "Module"
    Load "modesetting"
EndSection

Section "Device"
    Identifier "Device0"
    Driver "nvidia"
    BusID "PCI:1:0:0"
    Option "AllowEmptyInitialConfiguration"
EndSection