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backlightctl
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rely on max_brightness instead

This commit is contained in:
yosh 2022-12-27 00:14:09 -06:00
parent fd35c75289
commit 02eb57b446
2 changed files with 6 additions and 5 deletions
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9
backlightctl
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@ -1,7 +1,7 @@
#!/bin/sh
set -euf
BACKLIGHT_PATH="${BACKLIGHT_PATH:-/sys/class/backlight/amdgpu_bl0/brightness}"
BACKLIGHT_PATH="${BACKLIGHT_PATH:-/sys/class/backlight/amdgpu_bl0}"
errecho() {
>&2 printf '%s\n' "$*"
@ -22,7 +22,8 @@ If -s and -c are specified, -c takes priority
q=
nb=
cb="$(cat "$BACKLIGHT_PATH")"
mb="$(cat "$BACKLIGHT_PATH/max_brightness")"
cb="$(cat "$BACKLIGHT_PATH/brightness")"
while getopts :hqs:c: OPT; do
case $OPT in
h) usage ;;
@ -36,7 +37,7 @@ done
errecho "Current brightness: $cb"
[ -z "$nb" ] && errecho "Brightness not changed" && exit 0
[ "$nb" -gt 255 ] && nb=255
[ "$nb" -gt "$mb" ] && nb=255
[ "$nb" -lt 0 ] && nb=0
printf '%s' "$nb" > "$BACKLIGHT_PATH" && errecho "New brightness: $nb" || errecho "Error setting brightness!"
printf '%s' "$nb" > "$BACKLIGHT_PATH/brightness" && errecho "New brightness: $nb" || errecho "Error setting brightness!"

2
readme.md
View File

@ -2,7 +2,7 @@
A simple script to change the backlight brightness value on laptops. Mostly made as a workaround for [this bug](https://bugzilla.kernel.org/show_bug.cgi?id=203905).
## Configuration
The only configurable variable is the backlight path. It defaults to `/sys/class/backlight/amdgpu_bl0/brightness`. You can change `BACKLIGHT_PATH` to point to the file path.
The only configurable variable is the backlight path. It defaults to `/sys/class/backlight/amdgpu_bl0`. You can change `BACKLIGHT_PATH` to point to the file path.
## Usage
```