I can confirm this on my XPS M1330 as well, but it will sometimes happen
when the lid is closed and opened.

I came across a workaround while trying to diagnose it:
0) First know that Ctrl-Alt-F7 brings you back to your X session (I've seen 
people get stuck in terminal mode)
1) Hit Ctrl-Alt-F1 to take you to a plain terminal. 
2) Optional: run "showkey" to see if it's repeating key 113 (Mute). In my case, 
it showed nothing unusual but...
3) Ctrl-Alt-F7 to switch back to X. When I got back to X, the problem had 
resolved.

I *hate* Heisenbugs, but workarounds are nice :)

(Incidentally, showkeys is a useful tool for debugging this and other
softkey issues. Give it a whirl.)

-- 
Jaunty:  volume control freaks out when resuming from sleep
https://bugs.launchpad.net/bugs/363936
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