Same problem on ubuntu 13.10 and nvidia-prime (319 and 319-update).
Screen freeze randomly when using touch pad, and to fast "unfreeze" the screen I've to switch to console terminal (Ctrl+Alt+F1) and back to graphical console (Ctrl+Alt+F7)
Asus K53S with Nvidia Optimus (GT 540m)
Same problem on ubuntu 13.10 and nvidia-prime (319 and 319-update).
Screen freeze randomly when using touch pad, and to fast "unfreeze" the screen I've to switch to console terminal (Ctrl+Alt+F1) and back to graphical console (Ctrl+Alt+F7)
Asus K53S with Nvidia Optimus (GT 540m)