[Bug 38539] New: AMD Radeon 6950 (Cayman): Short freezes with KDE

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38539

           Summary: AMD Radeon 6950 (Cayman): Short freezes with KDE
           Product: xorg
           Version: 7.6
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: gtdev at spearhead.de
         QAContact: xorg-team at lists.x.org


Created an attachment (id=48252)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=48252)
dmesg output

Since I upgraded from a Radeon HD4870 to a 6950, I'm getting frequent short
freezes of up to maybe 5-6 seconds when KDE draws (new? large?) surfaces, e.g.
when a new application opens, or when switching desktops with effects enabled.
I haven't encountered the freezes without acceleration yet.

What happens is that sometimes, the system seems to stop entirely, but it
really seems to be limited to the X server. The image is frozen, the mouse
pointer does not move, and the system does not react to e.g. the numlock key.
Additionally, sometimes when it happens when clicking the mouse (e.g. when
trying to get a partially covered window to the foreground) the system seems to
miss the button-up event and handles mouse movements after recovery like
dragging.

However, mplayer in the background continues playing without even a hitch.

There are no messages related to this in dmesg, syslog, Xorg.log, or
.xsession-errors. I'm attaching dmesg and Xorg.0.log anyway.

xorg and the radeon driver are from Debian packages. Versions:
 * xserver-xorg: 1:7.6+7
 * xserver-xorg-video-radeon: 1:6.14.2-1

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