silent@Linux:~$ sudo cat /var/log/Xorg.0.log|grep EE
Password:
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(II) Loading extension MIT-SCREEN-SAVER
(EE) Failed to initialize GLX extension (Compatible NVIDIA X driver not found)
(EE) xf86OpenSerial: Cannot open device /dev/wacom
(EE) xf86OpenSerial: Cannot open device /dev/wacom
(EE) xf86OpenSerial: Cannot open device /dev/wacom