[REGRESSION] Brightness at max level after waking up from sleep on AMD Laptop

[Linux regression tracking (Thorsten Leemhuis)]

[+amd-glx, +lkml, +dri-devel]

On 27.07.24 18:52, serg.partizan at gmail.com wrote:
> 
> After updating from 6.8.9 to 6.9.1 I noticed a bug on my HP Envy x360
> with AMD Ryzen 5 4500U.
>
> [...]
> After waking up from sleep brightness is set to max level, ignoring
> previous value.
> 
> With the help of Arch Linux team, we was able to track bad commit to
> this:
> https://gitlab.freedesktop.org/agd5f/linux/-/commit/63d0b87213a0ba241b3fcfba3fe7b0aed0cd1cc5

Hamza Mahfooz, in case you missed it, that is a patch of yours:
63d0b87213a0ba ("drm/amd/display: add panel_power_savings sysfs entry to
eDP connectors") [v6.9-rc1].

> I have tested this on latest mainline kernel:
> 
> Results after waking up:
> 
>> cat /sys/class/backlight/amdgpu_bl1/{brightness,actual_brightness}
> 12
> 252
> 
> Then, on exact this commit (63d0b87213a0ba241b3fcfba3fe7b0aed0cd1cc5),
> result is the same.
> 
> Then, on commit just before this one (aeaf3e6cf842):
> 
>> cat /sys/class/backlight/amdgpu_bl1/{brightness,actual_brightness}
> 12
> 12
> 
> I hope I included all relevant information, more info can be found here:
> 
> https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/52

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

P.S.:

#regzbot introduced: 63d0b87213a0ba241