OK, bisected.

914b4bb80c28c81101941d5533361ae0108eb771 is the first bad commit
commit 914b4bb80c28c81101941d5533361ae0108eb771
Author: Marek Olšák <maraeo@gmail.com>
Date:   Wed Feb 29 13:09:51 2012 +0100

    r600g: add support for missing colorbuffer formats

    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Reviewed-by: Christian König <christian.koenig@amd.com>

:040000 040000 05adc23b1529b09afffcde046bd76f4417339138
90f988f39ed5ed836c38d6509d9ddcdbdc318463 M      src

Changed to 9.0 version.