https://bugs.kde.org/show_bug.cgi?id=472456
Bug ID: 472456
Summary: Windows wakes up from screen saving mode in full
brightness
Classification: Plasma
Product: kwin
Version: 5.27.6
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: koncek.mar...@gmail.com
Target Milestone: ---
SUMMARY
When lowering a laptop's brightness to a minimum (i. e. 0 %) by pressing the Fn
keys, waiting for the screen saving (which turns off the screen) mode to
activate and then moving the mouse to wake the screen, the screen has maximum
brightness.
It is worth mentioning that changing the brightness with Fn keys behaves as-if
the brighntess was at 0 %. I. e. lowering the brightness goes to 0 %,
increasing it goes to 5 %.
When the brightness is above 0 %, then it wakes up to the correct previous
brightness.
This behaviour was also different some ~ 2 years ago, when the screen would
wake up to the 5 % (?) or some other small value that was not 0 %.
STEPS TO REPRODUCE
1. On a laptop, manually lower the screen's brightness to 0 %. (The screen is
now almost completely black)
2. Wait for the screen saving mode to turn off the screen (not sleep, not
screen dim)
3. Perform any action that wakes up the screen. (e. g. move mouse)
OBSERVED RESULT
Laptop screen now has 100 % brightness.
EXPECTED RESULT
Screen should wake up with the minimal **user-visible** screen brightness, i.
e. one Fn button press away from 0 %. Which usually is 5 %.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora KDE 38
(available in About System)
KDE Plasma Version: 5.27.6
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.10
ADDITIONAL INFORMATION
This issue was observer first time a few years ago.
Behaviour is the same on X11 and Wayland.
Behaviour is the same no matter whether external monitors are connected.
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