Initial Commit

backlightctl

@@ -0,0 +1,42 @@
+#!/bin/sh
+set -euf
+
+BACKLIGHT_PATH="${BACKLIGHT_PATH:-/sys/class/backlight/amdgpu_bl0/brightness}"
+
+errecho() {
+	>&2 printf '%s\n' "$*"
+}
+
+usage() {
+	errecho "\
+Usage: ${0##*/} [-hq] [-s VALUE] [-c VALUE]
+No arguments: Print current brightness and exit
+If -s and -c are specified, -c takes priority
+
+ -h         show this help
+ -q         print current brightness to stdout and exit
+ -s <VALUE> set brightness to VALUE
+ -c <VALUE> change brightness by VALUE"
+ 	exit 0
+}
+
+q=
+nb=
+cb="$(cat "$BACKLIGHT_PATH")"
+while getopts :hqs:c: OPT; do
+	case $OPT in
+		h) usage ;;
+		q) q=1 ;;
+		s) nb=$OPTARG ;;
+		c) nb=$((cb + OPTARG)) ;;
+		*) exit 1 ;;
+	esac
+done
+[ $q ] && echo "$cb" && exit 0
+errecho "Current brightness: $cb"
+
+[ -z "$nb" ] && errecho "Brightness not changed" && exit 0
+[ "$nb" -gt 255 ] && nb=255
+[ "$nb" -lt 0 ] && nb=0
+
+printf '%s' "$nb" > "$BACKLIGHT_PATH" && errecho "New brightness: $nb" || errecho "Error setting brightness!"

readme.md

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+# backlightctl
+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.
+
+## Usage
+```
+Usage: backlightctl [-h] [-s VALUE] [-c VALUE]
+No arguments: Print current brightness and exit
+If -s and -c are specified, -c takes priority
+
+ -h         show this help
+ -q         print current brightness to stdout and exit
+ -s <VALUE> set brightness to VALUE
+ -c <VALUE> change brightness by VALUE
+```
+
+## Recommendations
+- Move this script to `/usr/local/bin`
+- If your backlight isn't saved on reboot, add the following to `/etc/rc.local`:
+```
+/usr/local/bin/backlightctl -s <your_preferred_brightness>
+```
+- (doas) add the following to `/etc/doas.conf`:
+  - I don't know the equivalent sudo rule for this
+```
+permit nopass :wheel as root cmd backlightctl
+```