Bug 210678

Summary:	Logout effect only shows black screen
Product:	[Plasma] kwin	Reporter:	Christoph Feck <cfeck>
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	anarsoul, gio.grifis, jimreynold2nd, mirza.dervisevic
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	unspecified
OS:	Linux
Latest Commit:		Version Fixed In:

Description Christoph Feck 2009-10-15 16:24:24 UTC

Version:           unknown (using 4.3.72 (KDE 4.3.72 (KDE 4.4 >= 20091013)), compiled sources)
Compiler:          gcc
OS:                Linux (i686) release 2.6.31.3-1-desktop

When I don't use logout effect, I get a dimmed screen. But when using the logout effect, the screen is just black (the dialog is okay). This is a quite recent regression, possibly also related to kdm?

Compositing mode: OpenGL on intel i945

Comment 1 Martin Flöser 2009-10-15 17:25:42 UTC

setting useBlur to false resolves the problem. It seems like Intel driver magically supports FBOs, now (at least it's listed in glxinfo) but in truth doesn't. So it's actually an Intel driver bug.

But we have to keep a look on this bug (that is more complains) as openSUSE will ship that driver version. If it causes problems we have to inform our downstreams and disable useBlur for all users :-(

Comment 2 Giovanni Masucci 2009-10-15 18:04:04 UTC

The new kubuntu karmic, (that will be released at the end of this month) is also affected by this bug (intel drivers 2.9.0)

Comment 3 lucas 2009-10-16 12:36:20 UTC

SVN commit 1036024 by lmurray:

Detect when we receive an incomplete FBO and consider it invalid.
CCBUG: 210678


 M  +7 -4      kwinglutils.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1036024

Comment 4 Christoph Feck 2009-10-21 00:34:12 UTC

*** Bug 211267 has been marked as a duplicate of this bug. ***

Comment 5 Christoph Feck 2009-11-28 22:21:30 UTC

*** Bug 216566 has been marked as a duplicate of this bug. ***

Comment 6 Vasily Khoruzhick 2010-01-14 12:31:45 UTC

Actually, FBOs works on intel (at least mesa fbo demo, and qt fbo demo works on my 945gm), so probably it's KDE bug. It seems that some of these conditions is not met (look through intel_fbo.c/intel_validate_framebuffer() from i915 mesa driver):

- attachment is stencil only, intel driver supports only combined depth/stencil attachment
- texture format is not one of these: ARGB8888, XRGB8888, RGB565, ARGB1555, ARGB4444