https://bugs.freedesktop.org/show_bug.cgi?id=34567
--- Comment #2 from Andy Furniss lists@andyfurniss.entadsl.com 2011-02-22 07:35:34 PST --- (In reply to comment #1)
The commit 7ac3a2e0bcdadff7c7172a9f833f526b526da16b belongs to the xf86-video-ati git. (To make clear it does not belong to the drm-radeon-testing git branch).
I also see this bug with on my rv790 32bit build.
I notice that using d-r-t from January works OK with current git ddx.