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