o q pode ser este erro???
cat /var/log/Xorg.0.log | grep EE
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(II) Loading extension MIT-SCREEN-SAVER
(EE) AIGLX error: dlopen of /usr/lib/dri/mach64_dri.so failed (/usr/lib/dri/mach64_dri.so: cannot open shared object file: No such file or directory)
(EE) AIGLX: reverting to software rendering