Turns out I had some old libdrm_radeon and mesa libGL files being loaded from a manual install a while ago.
I compiled glamor from git but the packaged glamor would probably work fine.
I am using a radeon 7750 with ubuntu 13.10 and gnome3. I haven't done much besides open a browser to write this post, but I will give an update if I notice any screen corruption.
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD CAPE VERDE
OpenGL version string: 2.1 Mesa 9.2.1
OpenGL shading language version string: 1.30