Bug 20945

Summary:	Kernel Panic on exit X11 and constantly degrade in performance radeon 6.12.1 with xorg-server-1.5.3 & linux-2.6.28+
Product:	xorg	Reporter:	Oliver Maurhart <oliver.maurhart>
Component:	Driver/Radeon	Assignee:	xf86-video-ati maintainers <xorg-driver-ati>
Status:	RESOLVED NOTOURBUG	QA Contact:	Xorg Project Team <xorg-team>
Severity:	critical
Priority:	medium
Version:	7.4 (2008.09)
Hardware:	All
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Oliver Maurhart 2009-03-30 04:37:24 UTC

I'm running a Gentoo System with an 
* ATI Mobility X600
* KDE4.2.1
* xorg-server-1.5.3-r5
* xf86-video-ati-6.12.1

Since kernel 2.6.28-gentoo-r3, 2.6.28-gentoo-r4 and 2.6.29-gentoo I'm experiencing Kernel Panic on x11-exit. For short it says something like this:

vblank_disable_fn
vblank_disable_fn
run_timer_softirq
__do_softirq
...

And then all LEDs on my Laptop are blinking ... (is there a chance to get the output electronically?)

Since I experienced a slow degrade of performance in KDE (see https://bugs.kde.org/show_bug.cgi?id=186839) I assume the xf86-video-ati to be some sort broken on my installation. I sense the Xorg-Server constantly consuming more and more CPU over a period of 6 hours (starting at aroung 6% up to 25%) and the system's performance (KDE's and Konsole's performance respectively) constantly going down to unusability and finally giving me a Kernel Panic at xorg exit.

What can I do?

Comment 1 Michel Dänzer 2009-03-30 04:47:19 UTC

A kernel panic is by definition a kernel bug. You should probably take this up with the Gentoo kernel maintainers (e.g. in case they patched the drm/radeon kernel modules).

As for the X server performance degrading over time, that's probably unrelated. If you're using EXA, it could be due to EXA offscreen memory fragmentation. If VT switching to console and back to X restores performance, that's probably it, and you could try my defragmentation patch (latest iteration posted at http://lists.x.org/archives/xorg-devel/2009-March/000489.html).

Comment 2 Oliver Maurhart 2009-03-30 05:40:22 UTC

Hm, ok, I filed https://bugs.gentoo.org/show_bug.cgi?id=264280

.. and yes, I was using EXA indeed. I'll try XNA again. At first glance switching to console and back to X11 didn't impove anything. But this is a mere subjective feeling by now.

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