https://bugs.freedesktop.org/show_bug.cgi?id=42067
--- Comment #5 from Harald Judt h.judt@gmx.at 2011-12-06 04:43:47 PST --- This problem is still there in linux-3.2-rc4, and clearly related to using s3tc libtxc_dxtn, as it does not happen when the library is not available.
Fixing this would also make it possible to play games on cayman gpus that require s3tc.