https://bugs.kde.org/show_bug.cgi?id=504766
Bug ID: 504766
Summary: Wayland: White/Black filcker on fullscreen, Dual
monitor, "same" refresh
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: linux....@astrusia.org
Target Milestone: ---
Created attachment 181729
--> https://bugs.kde.org/attachment.cgi?id=181729&action=edit
output of edid decode when X34P is set to accuracy and the other to efficiency
SUMMARY
[Bazzite 42]
Mild 1Hz white/black screen flicker occurs on one display (Acer X34P) in a
dual-monitor configuration under KDE Wayland on AMD GPU.
The issue is resolved by setting "Color Accuracy" to "Prefer accuracy" in
display settings.
STEPS TO REPRODUCE
Use two monitors:
X34P at 120Hz (DP-2)
Secondary at 120Hz or 144Hz (DP-1)
Ensure both are enabled on KDE Wayland
Set "Color Power Preference" to "Prefer efficiency" specifically the X34P
Open a fullscreen window (e.g. game or video) on one display
Move mouse in/out of fullscreen or change focus
Only observed on YT playback:
also flickers when audio level change indicator pops in/out
also flickers when YT seek bar pops in/out
OBSERVED RESULT
Full-screen white flash on X34P when mouse moves out of fullscreen window
Full-screen black flash when focus returns
Flicker rate is ~1Hz and consistent
Only occurs on one screen
Does not happen:
When both monitors are at 60Hz
If either monitor is at 60Hz while the other is 120Hz
On an X11 session
(did not try gnome, I did not want to install it :P )
also happens when refresh rate is maxed for both X34P (120Hz) and the Acer
EXPECTED RESULT
No flickering. Smooth refresh switching across displays.
SOFTWARE/OS VERSIONS
from kinfo:
Operating System: Bazzite 42
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.6-105.bazzite.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X3D 8-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XTX
---
Monitors: Acer X34P, Acer XV272U
ADDITIONAL INFORMATION
Disclaimer: I mostly talked with ChatGPT about this because I could not find
anything on the webs, so the report is mostly made by me asking it to generate
one, since it knew all the info and it was faster. I checked the accuracy. The
kinfo report, edid-decode, and kscreen-doctor are of course directly from
terminal, I am not this dense.
If I missed anything, sorry. Please ask nicely, I am new. I tried a bunch of
stuff to fix this. In the last lines of the edid-decode you can see the
slightly different refresh rates. (Detailed Timing Descriptors section). 120Hz
is relevant one here.
output of kscreen-doctor -o when X34P is set to accuracy and the other to
efficiency:
Output: 1 DP-1
enabled
connected
priority 2
DisplayPort
Modes: 1:2560x1440@144! 2:2560x1440@120* 3:2560x1440@60
4:2560x1440@60 5:1920x1200@144 6:1920x1080@120 7:1920x1080@120
8:1920x1080@60 9:1920x1080@60 10:1920x1080@60 11:1920x1080@50
12:1600x1200@144 13:1680x1050@60 14:1280x1024@75 15:1280x1024@60
16:1440x900@60 17:1280x960@60 18:1280x800@60 19:1152x864@75 20:1280x720@60
21:1280x720@60 22:1280x720@60 23:1280x720@50 24:1280x720@50 25:1024x768@75
26:1024x768@70 27:1024x768@60 28:832x624@75 29:800x600@75 30:800x600@72
31:800x600@60 32:800x600@56 33:720x576@50 34:720x576@50 35:720x480@60
36:720x480@60 37:720x480@60 38:720x480@60 39:640x480@75 40:640x480@73
41:640x480@67 42:640x480@60 43:640x480@60 44:720x400@70 45:1600x1200@60
46:1280x1024@60 47:1024x768@60 48:1920x1200@60 49:2560x1440@60
50:1920x1080@60 51:1600x900@60 52:1368x768@60 53:1280x720@60
Geometry: 0,0 2560x1440
Scale: 1
Rotation: 1
Overscan: 0
Vrr: Never
RgbRange: Automatic
HDR: disabled
Wide Color Gamut: disabled
ICC profile: none
Color profile source: sRGB
Color power preference: prefer efficiency and performance
Brightness control: supported, set to 100% and dimming to 100%
Output: 2 DP-2
enabled
connected
priority 1
DisplayPort
Modes: 54:3440x1440@60! 55:3440x1440@120* 56:3440x1440@100
57:3440x1440@85 58:3440x1440@50 59:1920x1200@60 60:1920x1080@60
61:1600x1200@60 62:1680x1050@60 63:1280x1024@60 64:1440x900@60
65:1280x800@60 66:1280x720@60 67:1024x768@60 68:800x600@60 69:640x480@60
70:640x480@60 71:1600x1200@60 72:1280x1024@60 73:1024x768@60
74:1920x1200@60 75:1280x800@60 76:2560x1440@60 77:1920x1080@60
78:1600x900@60 79:1368x768@60 80:1280x720@60
Geometry: 2560,0 3440x1440
Scale: 1
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: Automatic
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
Color profile source: EDID
Color power preference: prefer accuracy
Brightness control: supported, set to 100% and dimming to 100%
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