https://bugs.kde.org/show_bug.cgi?id=495003
Bug ID: 495003
Summary: KDE doesn't set max. backlight brightness correctly on
AMDGPU laptop
Classification: Plasma
Product: Powerdevil
Version: 6.2.1
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: thederpywo...@gmail.com
CC: natalie_clar...@yahoo.de
Target Milestone: ---
SUMMARY
Changing the backlight brightness using PowerDevil doesn't allow it to go to it
absolute potential.
Upon setting the brightness to 100%, we can see that in
`/sys/class/backlight/amdgpu_bl1/brightness` reads 100, however in
`max_brighntess` we get 255 and writing that into the brightness file yields a
way brighter output.
STEPS TO REPRODUCE
1. Set the brightness to 100% using PowerDevil
OBSERVED RESULT
Display's brightness set to only 100/255.
EXPECTED RESULT
Display's brightness to be set to 255.
(`/sys/class/backlight/amdgpu_bl1/max_brightness`)
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.2.1
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.9.10-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 6800HS with Radeon Graphics
Memory: 14.9 GiB of RAM
Graphics Processor: AMD Radeon 680M
ADDITIONAL INFORMATION
Additional files in the `/sys/class/backlight/amdgpu_bl1` sysfs (while KDE
thinks the backlight is at "100%"):
```
/sys/class/backlight/amdgpu_bl1/actual_brightness : 100
/sys/class/backlight/amdgpu_bl1/bl_power : 0
/sys/class/backlight/amdgpu_bl1/brightness : 100
/sys/class/backlight/amdgpu_bl1/type : raw
/sys/class/backlight/amdgpu_bl1/scale : unknown
/sys/class/backlight/amdgpu_bl1/max_brightness : 255
```
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