Bug 502426

Summary:	Blur effect looks chunkier and cruder than it uses to while panel popups are opening or closing
Product:	[Plasma] kwin	Reporter:	Nate Graham <nate>
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	niccolo, notmart, xaver.hugl
Priority:	NOR	Keywords:	regression
Version First Reported In:	master
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	6.4.80
Sentry Crash Report:
Attachments:	Blur glitches

Description Nate Graham 2025-04-04 20:17:29 UTC

STEPS TO REPRODUCE
1. Have a panel on the left side of the screen, which shows the issue a bit more dramatically than a bottom panel does
2. Click on anything on the panel that opens a popup, but especially the System Tray


OBSERVED RESULT
Blur effect looks, for lack of a batter way to describe it, sort of chunky and crude while the popup is opening or closing. See attached screen recording.


EXPECTED RESULT
Blur effect looks great.


ADDITIONAL INFORMATION
Semi-recent regression; it's been doing this for a few weeks IIRC, but didn't happen in Plasma 6.3.

Comment 1 Nate Graham 2025-04-04 20:44:39 UTC

Created attachment 180011 [details]
Blur glitches

Comment 2 Zamundaaa 2025-06-02 15:35:32 UTC

Looks like the blur texture has too little color resolution. Doesn't happen here though... can you still reproduce it?
Also, is this specifically the blur effect, or is the contrast effect enabled as well?

Comment 3 Nate Graham 2025-06-04 16:13:20 UTC

Looks like it's since stopped happening.