https://bugs.kde.org/show_bug.cgi?id=511226
Bug ID: 511226
Summary: External screen stays dimmed after getting turned off
on idle
Classification: Plasma
Product: plasmashell
Version First 6.5.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
SUMMARY
Given sequence of events: 1. external screen is dimmed, 2. external screen
turned off on idle, 3. external screen turned on due to quitting from idle;
you'll find external screen being still being dim.
Having debugged Powerdevil, I see that the pre-dim brightness value is being
set correctly. I presume what happens is that when the screen turns on (which
happens with ≈1 sec delay), Powerdevil sends brightness change before the
screen is on, and screen simply ignores the setting. Presumably brightness
should be set after the screen is on.
However, this part of code I don't know, so that this point I'm reporting a
bug.
STEPS TO REPRODUCE
1. Connect external screen to a laptop
2. Wait for external screen to dim
3. Wait for external screen to turn off
4. Poke a mouse to wake the screen up and observe the brightness
OBSERVED RESULT
Screen is still dimmed
EXPECTED RESULT
Screen should have pre-dim brightness
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.5-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i5-10500H CPU @ 2.50GHz
Memory: 16 GiB of RAM (15.3 GiB usable)
Graphics Processor 1: Intel® UHD Graphics
Graphics Processor 2: NVIDIA GeForce RTX 3050 Ti Laptop GPU
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