High CPU usage has always been a problem for the Nvidia driver. Although high CPU when no apps are running is new... Do you have any non-Ubuntu GNOME extensions running that might be updating the screen in ways you're not noticing? Xorg itself does idle to zero CPU very well so *something* external is probably triggering it.
High CPU usage has always been a problem for the Nvidia driver. Although high CPU when no apps are running is new... Do you have any non-Ubuntu GNOME extensions running that might be updating the screen in ways you're not noticing? Xorg itself does idle to zero CPU very well so *something* external is probably triggering it.