An even better script so that all connected displays have their
brightness adjusted
#!/bin/bash
#-----------------------------------------------------------------
# /usr/local/bin/brightness
# be sure this file is executable
#-----------------------------------------------------------------
backlight_path=/sys/class/backlight/intel_backlight
luminance() {
read -r level < "$backlight_path"/actual_brightness
bc <<< "scale=10;$level/$max"
}
devices() {
xrandr | grep -w connected | awk '{ print $1 }'
}
apply() {
for device in $(devices)
do
echo "$device" "$1"
xrandr --output "$device" --brightness "$1"
done
}
read -r max < "$backlight_path"/max_brightness
apply "$(luminance)"
inotifywait -me modify --format '' "$backlight_path"/actual_brightness | while
read; do
apply "$(luminance)"
done
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1831587
Title:
brightness control not work with OLED panel
Status in HWE Next:
New
Status in OEM Priority Project:
New
Status in linux package in Ubuntu:
Triaged
Bug description:
image: disco 19.04
kernel: 5.0.0-15-generic
also verified failed on linux-image-unsigned-5.2.0-050200rc2-generic
also refer to :
-
https://askubuntu.com/questions/824949/lenovo-thinkpad-x1-yoga-oled-brightness
- https://bugs.freedesktop.org/show_bug.cgi?id=97883
Linux can not control the brightness on the OLED panel in the traditional way
[1].
Although there's a workaround from the community [2] that to execute script
while brightness hotkey event is triggered. But if we want to upstream it, it's
still a problem to recognize the OLED panel so that the system knows when to go
workaround.
- EDID of my laptop which has OLED: https://paste.ubuntu.com/p/w7rVqJTYDy/
- EDID of the same model without OLED: https://paste.ubuntu.com/p/P3ChhX9yBJ/
there's a kernel patch related OLED for reference:
- https://patchwork.kernel.org/patch/6133471/
[1] https://wiki.ubuntu.com/Kernel/Debugging/Backlight
[2]
https://askubuntu.com/questions/824949/lenovo-thinkpad-x1-yoga-oled-brightness
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