Bug 500488

Summary: VRR Monitor subtle brightness flicker with multiple monitors after triggering automatic VRR once
Product: [Plasma] kwin Reporter: Arttu <arttuc>
Component: platform-drmAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED UPSTREAM    
Severity: normal CC: xaver.hugl
Priority: NOR    
Version First Reported In: 6.3.1   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: drm_info

Description Arttu 2025-02-20 21:14:15 UTC 
SUMMARY
My VRR/FreeSync 144hz monitor starts very subtly flickering after a game has been in fullscreen once, even after the game is closed.

This only happens with my secondary 60hz monitor connected, it stops when the monitor is disabled or unplugged.

Disabling VRR in system settings doesn't stop it, I have to completely disable VRR in the monitor's settings.

STEPS TO REPRODUCE
1. Set VRR to Automatic in system settings
2. Launch any game and set it to fullscreen
3. Observe

SOFTWARE/OS VERSIONS
$ kinfo
Operating System: Arch Linux
KDE Plasma Version: 6.3.1
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.2-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i9-9900K CPU @ 3.60GHz
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 7800 XT

ADDITIONAL INFORMATION
Main monitor is a Samsung Odyssey G5 27″ 144hz connected with DisplayPort
Secondary monitor is an Acer "V246HL Widescreen LCD Monitor" 60hz connected with HDMI
Comment 1 Zamundaaa 2025-02-21 13:14:26 UTC 
The brightness flicker is bug 477016.

As for VRR not turning off, please attach the output of drm_info when that happens
Comment 2 Arttu 2025-02-21 21:02:26 UTC 
Created attachment 178709 [details]
drm_info

Attached drm_info
Comment 3 Zamundaaa 2025-03-05 16:29:10 UTC 
Ok, so KWin does turn VRR off, so this is https://gitlab.freedesktop.org/drm/amd/-/issues/3546