Hello,
the backlight control no longer works on my ASUS UM325 (Ryzen 5700U)
OLED laptop. I have bisected the breakage to commit 7fd13baeb7a3a48.
commit 7fd13baeb7a3a48cae12c36c52f06bf4e9e7d728 (HEAD, refs/bisect/bad)
Author: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu Jul 8 16:31:10 2021 -0400
drm/amdgpu/display: add support for multiple backlights
On platforms that support multiple backlights, register
each one separately. This lets us manage them independently
rather than registering a single backlight and applying the
same settings to both.
v2: fix typo:
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reviewed-by: Roman Li <Roman.Li@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
I have encountered another user with the same issue on reddit[0].
The node in /sys/class/backlight exists, writing to it just does
nothing. I would be glad to help debugging the issue. Thank you very
much.
Regards,
Samuel Čavoj
[0]: https://www.reddit.com/r/AMDLaptops/comments/qst0fm/after_updating_to_linux_515_my_brightness/
