I've reverted to xorg.conf where Option "AccelMethod" "UXA" is specified, but no Driver.
The login screen was corrupted as described above. After login I switched to tty1 and waited for the music, then switched to tty7 and graphics. The screen looks OK. Desktop effects are disabled. I attach the output of Xorg.0.log, which seems to show several warnings and an error. I haven't yet tried a visual login on the tty7 screen.
I've reverted to xorg.conf where Option "AccelMethod" "UXA" is specified, but no Driver.
The login screen was corrupted as described above. After login I switched to tty1 and waited for the music, then switched to tty7 and graphics. The screen looks OK. Desktop effects are disabled. I attach the output of Xorg.0.log, which seems to show several warnings and an error. I haven't yet tried a visual login on the tty7 screen.