Created attachment 76846 [details]
Xorg.0.log

Running KDE 4.10.1 on Fedora 18.  After login, screen flickers a bit but
nothing is displayed other than the background image.

.xsession-errors contains:
OpenGL vendor string:                   X.Org R300 Project
OpenGL renderer string:                 Gallium 0.4 on ATI RV370
OpenGL version string:                  2.1 Mesa 9.1
OpenGL shading language version string: 1.20
Driver:                                 R300G
GPU class:                              R300
OpenGL version:                         2.1
GLSL version:                           1.20
Mesa version:                           9.1
Linux kernel version:                   3.8.3
Direct rendering:                       yes
Requires strict binding:                yes
GLSL shaders:                           limited
Texture NPOT support:                   limited
Virtual Machine:                        no
r300: Implementation error: Render targets are too big in
r300_set_framebuffer_state, refusing to bind framebuffer state!

this r300 messages keeps repeating.

kernel 3.8.3-203.fc18.i686.PAE

01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV370
5B60 [Radeon X300 (PCIE)]

Just updated from Fedora 16 where this system was working fine.