$ cat /var/log/Xorg.0.log.old | grep EE
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(II) Loading extension MIT-SCREEN-SAVER
(EE) Feb 05 10:34:39 NVIDIA(0): Failed to initialize the NVIDIA kernel module. Please see the
(EE) Feb 05 10:34:39 NVIDIA(0):     system's kernel log for additional error messages and
(EE) Feb 05 10:34:39 NVIDIA(0):     consult the NVIDIA README for details.
(EE) NVIDIA(0):  *** Aborting ***
(EE) Screen(s) found, but none have a usable configuration.