> $ lsmod | grep nvidia > if there's no output, you aren't using the nvidia driver. > Run > $ grep nvidia /var/log/dmesg No output > $ grep EE /var/log/Xorg.0.log Only output here is (WW) warning, (EE) error, (NI) not implemented, (??) unknown. [ 19.290] (II) Loading extension MIT-SCREEN-SAVER