I have the gpu lockups too on an 7750 in different apps, for instance xonotic.
I did a bisect and it led to this commit:

e8f9195e5fb34a45783d6491d2e0305a0b137439 is the first bad commit
commit e8f9195e5fb34a45783d6491d2e0305a0b137439
Author: Axel Davy <axel.davy@ens.fr>
Date:   Thu Aug 15 12:47:58 2013 +0200

    gallium, intel: Implements new __DRI_IMAGE_USE_LINEAR and PIPE_BIND_LINEAR
flags to enforce no tiling.

    Signed-off-by: Axel Davy <axel.davy@ens.fr>

And indeed reverting it seems to fix the lockups.