Unfortunately releases >= 331.49 break hybrid graphics, and we're waiting for NVIDIA to fix the issue before we update the driver in Ubuntu.
You can still install an updated driver from the xorg-edgers PPA.
Can you reproduce the problem if you enter an Xfce session or a Unity session?
Unfortunately releases >= 331.49 break hybrid graphics, and we're waiting for NVIDIA to fix the issue before we update the driver in Ubuntu.
You can still install an updated driver from the xorg-edgers PPA.
Can you reproduce the problem if you enter an Xfce session or a Unity session?