os/pkgs/gpu-switch.nix

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2023-01-28 20:49:10 +00:00
self: with self; ''
2022-01-19 00:13:15 +00:00
# Copyright (c) 2014-2015 Bruno Bierbaumer, Andreas Heider
readonly sysfs_efi_vars='/sys/firmware/efi/efivars'
readonly efi_gpu='gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9'
usage(){
cat <<EOF
Usage:
$(basename $0) --integrated # Switch to the integrated GPU
$(basename $0) --dedicated # Switch to the dedicated GPU
$(basename $0) --help # Show this message
Switches between the integrated and dedicated graphics cards of a dual-GPU
MacBook Pro for the next reboot.
Arguments:
-i, --integrated
-d, --dedicated
-h, --help
Tested hardware:
MacBook Pro 5,2 (Early 2009, Non-Retina)
MacBook Pro 5,3 (Mid 2009, Non-Retina)
MacBook Pro 8,2 (Late 2011, Non-Retina)
MacBook Pro 9,1 (Mid 2012, Non-Retina)
MacBook Pro 10,1 (Mid 2012, Retina)
MacBook Pro 11,3 (Late 2013, Retina)
MacBook Pro 11,5 (Mid 2015, Retina)
EOF
}
switch_gpu(){
if ! [ -d /sys/firmware/efi ]; then
printf "Fatal: $(basename $0) has to be run in EFI mode.\n" 1>&2
exit 1
fi
if ! mount | grep -q $sysfs_efi_vars; then
if ! mount -t efivarfs none $sysfs_efi_vars; then
printf "Fatal: Couldn't mount ''${sysfs_efi_vars}.\n" 1>&2
exit 1
fi
fi
chattr -i "''${sysfs_efi_vars}/''${efi_gpu}" 2> /dev/null
printf "\x07\x00\x00\x00\x''${1}\x00\x00\x00" > "''${sysfs_efi_vars}/''${efi_gpu}"
}
if [ $# -ne 1 ]; then
usage 1>&2
exit 1
fi
case "$1" in
-i|--integrated)
switch_gpu 1
;;
-d|--dedicated)
switch_gpu 0
;;
-h|--help)
usage
;;
*)
usage 1>&2
exit 1
;;
esac
''