After I upgraded from Debian Squeeze to Wheezy, the combination of Xfce and Xscreensaver doesn't seem to consider keyboard activity to be user activity.
Since I sometimes use only the keyboard for long periods of time, this means that eventually the screensaver activates because of a lack of mouse input. This is somewhat of an annoyance, but another key press (or a bump on the mouse) will cause the screensaver to go away and wait another period of time before kicking in again.
How do I make the system consider keyboard input to be activity? I looked at the screensaver preferences but couldn't find anything relevant.
Alternatively, how do I switch to a screensaver subsystem which does accept keyboard input as user activity? (All I want is a blank screen screensaver and monitor DPMI suspend and power-off after a configurable delay in X.)
In case it matters, I'm using a USB keyboard hooked directly to the PC (no USB hub in between). The mouse is also USB.