Running Fedora 20 with git xf86-video-ati and git mesa.
Xorg/Gnome starts ok with ddx commit 2fa021f77372ca93375a3d13a0c43a9089674899
(glamor: Remove unused function radeon_glamor_pixmap_is_offscreen).
Next commit 051d46382656ffc3e6cac1aab3aee7efdf5b623a does not work, xorg fails
to start, fails to produce a gui in some way or another.
Text screen remains without any keyboard interaction possible. SSH still works.
Bisected to get these commits.