Bug 308557

Summary:	blur left on screen
Product:	[Plasma] kwin	Reporter:	Leon Maurer <leon.maurer>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	NOR
Version:	4.9.2
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	Shows the blur on the upper left part of the screen -- above a window (obscuring it) and below the cursor. Output from qdbus org.kde.kwin /KWin supportInformation

Description Leon Maurer 2012-10-17 14:53:32 UTC

There's something that leaves a blur on the screen. See the attached image, where the cursor is. The blur goes over any windows, but underneath the cursor. The blur goes away with a 'kwin --replace'.

I'm not sure exactly what causes the blur. It only seems to happen after the screen saver/screen sleep has been active for a while (e.g. if I leave the computer on overnight). However, that's about the location where notifications appear, so maybe it's due to one of them that pops up while the screensaver/screen sleep is active.

Reproducible: Sometimes

Steps to Reproduce:
1. Leave computer for some time.
2. Come back to find blur.

Comment 1 Leon Maurer 2012-10-17 14:54:34 UTC

Created attachment 74602 [details]
Shows the blur on the upper left part of the screen -- above a window (obscuring it) and below the cursor.

Comment 2 Martin Flöser 2012-10-17 15:14:01 UTC

please provide output of 
qdbus org.kde.kwin /KWin supportInformation
when the problem is visible

Comment 3 Thomas Lübking 2012-10-17 15:46:31 UTC

and afterwards check whether it's also reproducible when disabling caching in the blur settings (looks like what i inintially ran into reg. bug #307112 but could not reproduce afterwards)

Comment 4 Leon Maurer 2012-10-17 15:56:37 UTC

Thomas, could you provide more specific instructions? If I go to configure 'Blur' in the Desktop Effects system setting, I don't see anything about disabling caching, and I didn't see directions in skimming that bug report.

Comment 5 Thomas Lübking 2012-10-17 16:17:59 UTC

"Safe intermediate rendering results" - it's the only checkbox in the config dialog, below the slider.

Comment 6 Leon Maurer 2012-10-22 14:15:32 UTC

Created attachment 74726 [details]
Output from qdbus org.kde.kwin /KWin supportInformation

Comment 7 Leon Maurer 2012-10-22 14:17:21 UTC

Ok, I've run in to the blur again, so I've attached the requested output. I've now disabled the blur caching, and I'll see if I run in to this again.

Comment 8 Thomas Lübking 2012-10-22 19:25:45 UTC

> kwin4_effect_fade
> kwin4_effect_blur

Actually sounds related to bug #306186 now (unless the fade was in action for sth. entirely different, like a popup)

But also actually, the blur should take the opacity ("0") into account then.

Comment 9 Leon Maurer 2012-10-23 14:28:06 UTC

The bug still happens with blur caching disabled.

FWIW, I've also run in to that issue with the password dialog box; it was common for some time, but I haven't seen it in a little while now.

Comment 10 Martin Flöser 2013-01-07 17:09:49 UTC

given that Bug #306186 has been fixed for 4.10: please provide an update whether it solved the issue once you tested out 4.10.

Comment 11 Leon Maurer 2013-01-07 17:40:01 UTC

Will do. I may try out one of the release candidates before the final release.

Comment 12 Martin Flöser 2013-01-17 15:37:44 UTC

Let's do it different: I assume it's fixed. In case you are still able to reproduce once you have had the chance to give 4.10 a try, please reopen. I think that's easier as you cannot properly say that it is fixed given that there is no concrete way to reproduce it.