[Bug 63788] New: xorg consumes 100% cpu and slows down desktop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63788

          Priority: medium
            Bug ID: 63788
          Assignee: xorg-driver-ati at lists.x.org
           Summary: xorg consumes 100% cpu and slows down desktop
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: software at moritz-augustin.de
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/Radeon
           Product: xorg

Created attachment 78314
  --> https://bugs.freedesktop.org/attachment.cgi?id=78314&action=edit
xorg logfile (Xorg.0.log)

I am experiencing every day a very annoying problem. After some time of using
the computer (KDE, Firefox, Thunderbird) the xorg process takes 100% cpu and
only recovers after many minutes/hours (without guarantee). No error/warning in
the log file, the desktop and all GUI apps just gets terribly slow such that I
was instantly trying to install catalyst after recognizing that my card is not
yet supported anymore by it. 
Sometimes the cpu usage is in the 20-50% range and the system only partially
slows down. Sometimes the system is sacrified by 100% xorg cpu usage, which
makes me think of buying a new GPU. I cannot understand the causes for these
xorg cpu loads. The problem occurs with and without KDE desktop effects
enabled.

The problem started in 2013. I cannot determine the first day exactly. However,
in 2012 where I used an old version of xorg (I guess 1.12 and smaller) with an
according radeon driver version, the error did NOT show up. I cannot easily
roll back because the old arch packages are compiled against library versions
which do not exist anymore. Furthermore the problem indicates, that this is a
bug in the recent versions of either xorg-server or the radeon driver and we
should correct it. 
I want to debug it but I do not know how. Please, could you tell me how to get
the relevant informations?
While I am writting xorg is causing again 100% cpu. The xorg logfile  is
attached.

My graphics card is according to lspci a "01:00.0 VGA compatible controller:
Advanced Micro Devices [AMD] nee ATI RV730XT [Radeon HD 4670] (prog-if 00 [VGA
controller])"

I am using current archlinux with the following packages:
xorg-server 1.14.1-1
xf86-video-ati 1:7.1.0-3
linux 3.8.7-1
(additionally I am using KDE 4.10.2, Firefox 20.0.1 and Thunderbird 17.0.5)

The radeon driver (wihtout any xorg.conf file) is configured like this:
# cat /sys/class/drm/card0/device/power_profile 
mid
# cat /sys/class/drm/card0/device/power_method 
profile

Please, could you give me hints how to come up with all necessary informations
to understand and fix this issue?
Could it be possible that this problem is not due to x or radeon but another
application?

What else can I do to fix this issue/to work around?

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