After installation of latest x86_64 ATI drivers (my video card is radeon 3650) XOrg interface was significantly slowed down (it was impossible to make any gui action because of slowness). ps -aux on text console showed, that X takes 50% CPU time (1 core of core2duo cpu).
removal of ati kernel modules caused system load into black screen, sensitive only to ctrl+alt+del key sequence.
Failsafe load failed to the same result and I dont know how to load OS in text mode only to repair this problem.
Any suggestions? (Write me by pm please)
PS. without 3d drivers all OpenGL applications work slow like on 80386 CPU.