cannot map sys bios

Yesterday, I placed gnome and all dependencies in my packages.keywords (with the ~x86 keyword of course) so I could install gnome 2.10. Worked fine, but when I booted a few hours later, my X-server couldn't start. Normally there should be no correlation between these two facts, but it's the only thing that changed between a working and a non-workig X. This is the error I recieve:
(EE) RADEON(0): Cannot map SYS BIOS

Ikke was here yesterday night, but he couldn't fix it too. He tried with vesa, some modules and xorg.conf from a working ubuntu liveCD, but all without any effect. We also recompiled xorg, but this also wasn't the solution.

If you know any, please let me know! If I find it, I'll sure post the solution here.

You can find a more detailed error log here and my xorg.conf file here. Yesterday I worked graphical till 18 hours (I don't know when I restarted my X then), but it didn't work after I booted up at 0.30 am this morning. The packages I emerged yesterday can be found in my genlop log.