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

cat /sys/class/backlight/amdgpu_bl1/{brightness,actual_brightness}

cat /sys/class/backlight/amdgpu_bl1/{brightness,actual_brightness}

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

I have tested this on latest mainline kernel:

Results after waking up:

Quoted 1 line

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):

Quoted 1 line

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

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

Quoted 8 lines · On 27.07.24 18:52, [email protected] 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.

Quoted 3 lines

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].

Quoted 14 lines

I have tested this on latest mainline kernel:

Results after waking up:

Quoted 1 line

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):

Quoted 7 lines

Quoted 1 line

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

Hello,

After updating from 6.8.9 to 6.9.1 I noticed a bug on my HP Envy x360 with AMD Ryzen 5 4500U.

#regzbot introduced: v6.8.9..v6.9.1

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

[...]