Confirm on 13.04 and NP350E5C-S0A:
Result of pressing volume keys is unpredicatble and usually blocks keyboard. 
Not completely: Ctrl-Alt-F1 switches to tty, and after switching back keyboard 
works again; Ctrl-Alt-T launches terminal, and other shortcuts may work as well.

After going to tty and back volume keys produce no visible effect.
Showkey(1): pressed fn-f[678] aka mute, volume down, volume up
keycode 113 press
keycode 114 press
keycode 115 press

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  Keyboard blocked after having used volume keys

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