https://bugs.freedesktop.org/show_bug.cgi?id=34155
--- Comment #1 from Kristoffer Tangfelt revellion@gmail.com 2011-02-14 02:03:28 PST --- Just a me too on this, also seeing the same on my ArchLinux 64bit installation with an Mobility Radeon X1400 PCIE and DRM Testing with KMS PageFlip enabled.
ATI Dri version: 7.10.0.git20110206 Kernel version: 2.6.37-rc8-34105-g2b2fd60-dirty
i see those errors appear in my dmesg occasionally, and from what it appears the 3D performance goes down a bit sometimes after they have appeared. noticed by wobbly windows in compiz not being silk smooth after a couple of occurances.