https://bugs.kde.org/show_bug.cgi?id=487900
Bug ID: 487900
Summary: Unreliable external screen brightness control
Classification: Plasma
Product: Powerdevil
Version: git-stable-Plasma/6.1
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: m...@iyanmv.com
CC: m...@ratijas.tk, natalie_clar...@yahoo.de
Target Milestone: ---
SUMMARY
I think I was never able to control my external monitor (Dell U2518D)
brightness from Plasma, so I was surprised to see it in the "Brightness and
Color" applet after updating to Plasma 6.1 Beta. Super cool feature! It is way
faster than using the screen built-in menu.
Unfortunately, even though it works perfectly after booting, it becomes a bit
unreliable over time. It has happened already a few times but I still couldn't
manage to find an exact series of steps to reproduce the issue.
At some point, the slider doesn't do anything any more. Other times, the
brightness is changed to the very minimum, and after that trying to move the
slides shows weird values like "inf%" or "nan%".
I'm happy to help debug this since probably it's a very hardware specific
thing, but perhaps someone else can replicate the issue with other monitors?
STEPS TO REPRODUCE
1. Start Plasma
2. Lock the screen a few times
3. Turn off and on the monitor a few times
4. Wait and repeat previous steps
OBSERVED RESULT
Brightness control at some point stops working
EXPECTED RESULT
Brightness control is reliable
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.0.90
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.1
Kernel Version: 6.9.3-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 7900X3D 12-Core Processor
Memory: 93.5 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XT
Manufacturer: ASUS
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