X doesn't react to keyboard commands

[Jesper Holmberg <jesperh@dsv.su.se>]

Since a while ago, X doesn't react to keyboard commands (such as
ctrl+alt+backspace to kill it, or ctrl+alt+1 to switch to the console).
Nothing happens when I press these keyboard combinations. Does anyone know
what might be the problem?

I'm using testing/unstable, with this version of X:

xfree86-common                       4.3.0.dfsg.1-4

TIA

Jesper