[Bug 20945] New: Kernel Panic on exit X11 and constantly degrade in performance radeon 6.12 .1 with xorg-server-1.5.3 & linux-2.6.28+

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=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
           Version: 7.4
          Platform: All
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: oliver.maurhart at gmx.net
         QAContact: xorg-team at lists.x.org


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?


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