Bug 432299

Summary:	Firefox flickering and window ghost
Product:	[Plasma] kwin	Reporter:	AK-47 <chkboom>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	nate, tyler
Priority:	NOR
Version First Reported In:	5.20.90
Target Milestone:	---
Platform:	Other
OS:	Linux
URL:	https://bugzilla.mozilla.org/show_bug.cgi?id=1685263
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description AK-47 2021-01-30 06:00:33 UTC

SUMMARY
Using Firefox with native Wayland (firefox-wayland, or Firefox with MOZ_ENABLE_WAYLAND=1 set) regularly results in flickering, issues with windows not taking up the required size, and ghosting when Firefox is terminated or exits.

STEPS TO REPRODUCE
1. Run "firefox-wayland" OR: MOZ_ENABLE_WAYLAND=1 firefox
2. Try various things such as resizing the window (maximising/minimising) or switching tabs, browsing the web etc.
3. Exit Firefox

OBSERVED RESULT
STEPS 1-2: Eventually you will see the window flickering and becoming unusable as artifacts appear all over the place.
STEP 3: There is a 50/50 chance that ghosted pieces of Firefox window will remain.

EXPECTED RESULT
Smooth, predictable operation, as expected with any application. Has been a continual problem even with 5.20.5 and earlier.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Rawhide/Plasma 5.20.90
(available in About System)
KDE Plasma Version: 5.20.90
KDE Frameworks Version: 5.78.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

Comment 1 Vlad Zahorodnii 2021-02-02 15:13:18 UTC

Enable WebRender to work around the flickering issues.

Comment 2 AK-47 2021-02-04 09:45:48 UTC

I tried that, and the issue still occurs. Especially so if multiple tabs are opened, and is easily reproducable. In fact it is slightly worse with WebRender enabled.

Comment 3 SimplyCorbett 2021-02-17 14:39:23 UTC

I can confirm this bug exists. Enabling web render (for me) results in a black firefox screen.

Comment 4 Vlad Zahorodnii 2021-10-13 13:38:37 UTC

There were some fixes in Firefox. Marking as RESOLVED WORKSFORME. If you're still able to reproduce this issue, reopen this bug report.