https://bugs.freedesktop.org/show_bug.cgi?id=77785
--- Comment #15 from smoki smoki00790@gmail.com --- Not sure how to not effectively not expose that format for radeonsi:
http://lists.freedesktop.org/archives/mesa-dev/2013-January/033029.html
In dri2.c, dri_screen.c, dri_drawable.c... :) ?