I found a workaround using a script that is triggered by inotify.
I created the script called brightness in /usr/local/bin:
sudo nano /usr/local/bin/brightness
content:
--
#!/bin/sh
path=/sys/class/backlight/intel_backlight
luminance() {
read -r level < "$path"/actual_brightness
printf %.10f\\n "$((100 * level/max))e-2"
}
read -r max < "$path"/max_brightness
xrandr --output eDP-1 --brightness "$(luminance)"
inotifywait -me modify --format '' "$path"/actual_brightness | while read FILE
do
echo $(luminance)
xrandr --output eDP-1 --brightness "$(luminance)"
done
--
chmod 755 /usr/local/bin/brightness
Remarks:
- The script waits for change in
/sys/class/backlight/intel_backlight/actual_brightness.
- "intel_backlight" might be replaced the corresponding directory name in
/sys/class/backlight according to your installation.
- eDP-1 may be replaced by the display name (might be eDP1 or different). Check
the correct display name using the xrandr command.
Add the script to the in the system setting to be executed at login.
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https://bugs.launchpad.net/bugs/1872327
Title:
OLED brightness control on Intel Iris Plus Graphics G7
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