Comment # 2 on bug 62578 from Orion Poplawski

The problem is also present in mesa 9.0.3.  With that I also get the following
in dmesg:

Mar 20 13:51:28 aspen kernel: [162904.454217] [drm:r100_cs_track_check] *ERROR*
[drm] No buffer for z buffer !
Mar 20 13:51:28 aspen kernel: [162904.454224] [drm:radeon_cs_ib_chunk] *ERROR*
Invalid command stream !

But I don't seem to get that with 9.1.