Bug 483999

Summary:	Monitor HDR turned off when display turned off via system idling
Product:	[Plasma] kwin	Reporter:	Michelle Bowe <michael.g.bowe>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	me, natalie_clarius, nate, xaver.hugl
Priority:	NOR	Keywords:	wayland-only
Version First Reported In:	6.0.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Before output from drm_info After repro output from drm_info

Description Michelle Bowe 2024-03-19 13:52:06 UTC

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1. Use HDR monitor (in my specific case an Acer Technologies XB273K GP)
2. Verify HDR is turned on
3. Allow KDE to go idle
4. wait for display to turn off
5. wake the system

OBSERVED RESULT

Screen is dim and HDR is turned off in the monitor firmware and must be turned back on or to auto

EXPECTED RESULT

Screen is normal brightness and HDR setting in firmware should be the same as before going idle

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Comment 1 Michelle Bowe 2024-03-19 14:12:21 UTC

NOTE: This is not reproducible in Windows 11 (work laptop connected through a dock), nor is it reproducible by manually powering down and restarting the monitor using the power button, so there seems to be something about the way KDE is handling the power down when the system goes idle that is triggering the behavior.

Comment 2 Zamundaaa 2024-04-11 15:52:43 UTC

Please attach the output of drm_info before, and again after reproducing the issue

Comment 3 Michelle Bowe 2024-04-11 17:30:41 UTC

Created attachment 168402 [details]
Before output from drm_info

Comment 4 Michelle Bowe 2024-04-11 17:31:10 UTC

Created attachment 168403 [details]
After repro output from drm_info

Comment 5 Zamundaaa 2024-04-11 17:57:31 UTC

okay, KWin's still setting the output to HDR mode, so this is a driver bug. You can report it at https://forums.developer.nvidia.com/c/gpu-graphics/linux