On my laptop, Alt-F2 doesn't work with external USB keyboard if Num Lock is on.
Works if Alt is pressed on laptop's built-in keyboard (regardless if F2 is pressed on built-in or external keyboard).
If Num Lock is off, Alt-F2 works on both keyboards (as well as both cross-keyboard combinations where I press Alt on one keyboard and F2 on another).
Linux wish 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
On my laptop, Alt-F2 doesn't work with external USB keyboard if Num Lock is on.
Works if Alt is pressed on laptop's built-in keyboard (regardless if F2 is pressed on built-in or external keyboard).
If Num Lock is off, Alt-F2 works on both keyboards (as well as both cross-keyboard combinations where I press Alt on one keyboard and F2 on another).
Linux wish 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux