The recent behavior change in xscreensaver was in the case where it
could not grab the mouse or keyboard or both.
The old behavior was that it would lock anyway, possibly resulting in
a screen that could not be unlocked.
The new behavior is that if it can't get both grabs, it does not lock
the screen.
So, the behavior you're seeing suggests that when you VT-switch away
from X, the X keyboard and/or mouse become ungrabbable. That's weird.
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