[Bug 24587] New: HD3470 mobility hangs (more or less randomly) with KMS

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=24587

           Summary: HD3470 mobility hangs (more or less randomly) with KMS
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: scary.moo at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=30498)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=30498)
dmesg

Latest (2009-10-16) drm-next over 2.6.31.y , latest xf86-video-ati, mesa and
libdrm, all from git. 

When KMS is enabled, sometimes X (with the whole laptop) would hang. Sometimes
the screen suddenly becomes black, sometimes the image on screen remains, I can
still move the mouse, but keyboard and clicking/scrolling/everything is
unresponsive (and X takes 100% cpu). Sometimes I can ssh/sysrq, sometimes It
just doesn't work. Usually when it hangs and I can ssh to the laptop, the logs
show no particular error.

The thing usually happens few (10-15) seconds after I've started X, and it
usually follows the startup of a GTK app (I'm using xfce, no desktop
compositing/compiz stuff whatsoever).

The hanging happens 100% of the time if I'm using a preemptive kernel. If I
remove the preemptive option, sometimes it... survives :) As far as I can see
it either happens immediately or doesn't happen at all. 
Building drm as a module /seems/ to improve things, but I cannot say for
certain, it's just an impression.
modprobing drm with debug flag /seems/ to improve things even more. Not sure of
that either.


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