Bug 490517

Summary: Changing brightness with Night Light enabled causes un-night-light-tinted flickering
Product: [Plasma] kwin Reporter: Nate Graham <nate>
Component: night colorAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED FIXED    
Severity: normal Keywords: regression
Priority: NOR    
Version First Reported In: master   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: https://invent.kde.org/plasma/kwin/-/commit/eddced099df15ca82b95d840365064e5c01ee97d Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Flickering

Description Nate Graham 2024-07-19 18:01:41 UTC 
Created attachment 171798 [details]
Flickering

Everything KDE from today's git master with Qt 6.7.2 on top of Fedora KDE 40.


STEPS TO REPRODUCE
1. Make Night Light turn on somehow (always on, wait, change location, etc).
2. Change brightness via any method (keyboard keys, manipulating slider in widget, scroll over widget compact representation, etc)


OBSERVED RESULT
The brightness changes, but the screen flickers with un-night-light-tinted colors. See attached screen recording, and pardon my daughter's sleepy squeaking sounds, which are not a part of this issue.


EXPECTED RESULT
No un-tinted flickering.
Comment 1 Bug Janitor Service 2024-07-19 19:40:40 UTC 
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/6147
Comment 2 Zamundaaa 2024-07-19 20:48:48 UTC 
Git commit eddced099df15ca82b95d840365064e5c01ee97d by Xaver Hugl.
Committed on 19/07/2024 at 19:39.
Pushed by zamundaaa into branch 'master'.

backends/drm: don't unset degamma in prepareAtomicModeset

We're now using and, if necessary, un-setting the property in prepareAtomicPresentation

M  +0    -3    src/backends/drm/drm_pipeline.cpp

https://invent.kde.org/plasma/kwin/-/commit/eddced099df15ca82b95d840365064e5c01ee97d