Bug 306079

Summary:	Grid View bumpy behavior
Product:	[Plasma] kwin	Reporter:	Leszek Lesner <leszek.lesner>
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal
Priority:	NOR
Version:	4.9.0
Target Milestone:	---
Platform:	unspecified
OS:	Linux
URL:	http://youtu.be/WW8pd42x7ic
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Leszek Lesner 2012-08-31 13:23:29 UTC

I have set the left hot corner to activate the grid desktop effect (since I guess KDE 4.4). 
This does not work fine anymore on KDE 4.9.0 (see attached Videolink)
It shows a jumpy behavior that appears to happen randomly. (At least I was not able to fully reproduce it yet with just one instruction set) 



Reproducible: Sometimes

Steps to Reproduce:
1. Set left upper hot corner to open grid view
2. Move your mouse to the top left corner
Actual Results:  
Jumpy / Bumpy behavior. 
Feels just like its zooming in for a few seconds, after it zoomed out to the desktop grid view

Expected Results:  
Don't jump or bump or zoom in. 

Please see the first seconds of the attached video to see the problem.

Comment 1 Thomas Lübking 2012-08-31 14:52:53 UTC

Much likely bug #304375

a) does it happen with the XRender backend as well?
b) what kind of GPU

Comment 2 Martin Flöser 2012-08-31 14:59:07 UTC

This looks like Present Windows is not used in Desktop Grid. Could you please try whether the problem persists when activating the Present Windows effect for Desktop Grid.

Hint for the case you want to do videos again: set the animation speed to very slow, that quite often can help to see the issue better.

Comment 3 Leszek Lesner 2012-08-31 15:05:28 UTC

(In reply to comment #1)
> Much likely bug #304375
> 
> a) does it happen with the XRender backend as well?
> b) what kind of GPU

a) no it does not happen with it
b) Intel HD 3000

Comment 4 Leszek Lesner 2012-08-31 15:06:55 UTC

(In reply to comment #2)
> This looks like Present Windows is not used in Desktop Grid. Could you
> please try whether the problem persists when activating the Present Windows
> effect for Desktop Grid.
> 

It was and still is activated. And there is no visible change when deactivating it.

> Hint for the case you want to do videos again: set the animation speed to
> very slow, that quite often can help to see the issue better.

Thanks for the tip. I did not thought about that

Comment 5 Thomas Lübking 2012-08-31 15:18:00 UTC

assuming glCopyPixels -> glSwapBuffer issue.
please unlink and reopen the bug should the issue remain with 4.9.1 but the other bug is fixed

*** This bug has been marked as a duplicate of bug 304375 ***

Comment 6 Leszek Lesner 2012-08-31 17:12:13 UTC

I recompiled kde-workspaces by applying that patch from https://bugs.kde.org/show_bug.cgi?id=304375 (ok changed m_scene to scene as I applied the patch straight to 4.9.0 sources). 
Now I can confirm. It fixes my problem.

Comment 7 Thomas Lübking 2012-08-31 17:22:27 UTC

Ooaaaahhh - that's mean!
Now you took all the thrill, waiting for first users adapting 4.9.1 to see whether the patch works (for anyone but me)

You should have added a "spoiler alert!" warning!

=)
Many thanks, confirmation is much appreciated.