Ctrl+Alt+1 not generated in X11, but Ctrl+Alt+[2-9] is

[Maciej Kalisiak <mac@cs.toronto.edu>]

I discovered a bizarre problem with my XFree86 (xserver-xfree86 4.2.1-3): the
Ctrl+Alt+1 combo does not seem to be generated.  Under "xev" I see an event for
the Ctrl key down, Alt key down, but not for the 1... pressing 1 at that point
generates no X11 event.  Oddly, the other digits in 1's place work fine.  I've
even tested this by firing up just a plain xterm in .xsession instead of a
window manager, and running xev from there.

Any hints as to what might be wrong and how to proceed in uncovering the
culprit?  Can anyone verify that this combo works fine on their Debian setup?
(preferably on a setup similar to mine: Debian is setup here on a DELL Inspiron
7000 laptop; even a desktop Pentium II or higher might be still a good point of
reference).

-- 
Maciej Kalisiak       mac "at" dgp.toronto.edu       www.dgp.toronto.edu/~mac