https://bugs.freedesktop.org/show_bug.cgi?id=77785
--- Comment #18 from smoki smoki00790@gmail.com --- So i disabled it like in this commit, array size undefined and remove it:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=75b7e1df139676f2456fea4d3a5...
For PTTM and ATH games that does not help, but looks very similar to be format issue... it just needs alpha there but not got that :).