I am using Lubuntu 11.10 (original, not Ubuntu + LXDE) on a Vaio VPCEG series. After install of some network manager, my key Fn+F2 got a different function.
It's printed on it the blue symbol for MUTE. Well, it was working.
Now, if the sound is ON and I press Fn+F2, the sound will be muted and the icon on the bar is changed.
But I am not able to UNMUTE. If I press again, nothing happens.
Below is the result from xev. Helps are welcome. Thanks.
KeyRelease event, serial 41, synthetic NO, window 0x1a00001, root 0xb7, subw 0x0, time 2129709, (-432,-17), root:(667,296), state 0x0, keycode 121 (keysym 0x1008ff12, XF86AudioMute), same_screen YES, XLookupString gives 0 bytes: XFilterEvent returns: False