Bug 321504

Summary:	kwin incorrectly determines compositing type resulting in a black screen with a cursor
Product:	[Plasma] kwin	Reporter:	Olivier van der Toorn <oliviervdtoorn>
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	grave
Priority:	NOR
Version:	4.10.80
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	Output of qdbus org.kde.kwin /KWin supportInformation Output of glxinfo -l

Description Olivier van der Toorn 2013-06-22 19:26:20 UTC

I updated to KDE SC 4.10.80 on Kubuntu Raring (13.04) today, after rebooting and logging in I was greeted by a black screen with only a cursor showing. After a bit of digging around I found that if I changed the compositor type from OpenGL2 to XRender and rebooted I could login like normal again. Afterwards trying to enable OpenGL2 again throws a message that OpenGL2 is not supported on this system. I think the fallback to XRender failed somewhere.

Reproducible: Didn't try




The system I'm using is a HP Compaq 6730s: http://www.hp.com/hpinfo/newsroom/press_kits/2008/connecting/ds_bn_6730s.pdf

It uses an Intel Integrated graphics chip.

Comment 1 Thomas Lübking 2013-06-22 19:29:22 UTC

Please attach the output of "qdbus org.kde.kwin /KWin supportInformation" and "glxinfo -l"

Comment 2 Olivier van der Toorn 2013-06-22 19:43:18 UTC

Created attachment 80718 [details]
Output of qdbus org.kde.kwin /KWin supportInformation

Comment 3 Olivier van der Toorn 2013-06-22 19:44:00 UTC

Created attachment 80719 [details]
Output of glxinfo -l

Comment 4 Thomas Lübking 2013-06-22 19:50:04 UTC

Disable color correction, it's what causes the black screen.
Nevertheless, on that chip the fixed function path (GL 1.3) or GLES (kwin_gles) will probably get you better performance on eg. blurring.

*** This bug has been marked as a duplicate of bug 321217 ***