I have Lenny 5.0.4 from DVD.
I am using blackbox window manager and bbkeys.
I am mostly working in xterm, screen (end emacs under screen).
As I am working with some program it often happens that I 'forget'
my finger on the Shift key pressed. If I hold it pressed for
several seconds pc speaker beep once. If I repeat same mistake
more times in a row it beep in different tones. And finally the keyboard
becomes unusable - it beeps after any keystroke but none of the
programs running respond to keyboard input. Only remedy then is to
use mouse and exit blackbox - restart is not enough - it has to go
all the way to gdm login screen. After I login again (actually
autologin) I can continue with my work thanks to screen. Only
programs requiring X are gone.
My guess is that beeping is done by X server - because I have
set visual bell in screen. It probably should be noted that
I am using keyboard for mouse emulation too. But when the
keyboard start beeping on every keystroke I must use real
mouse to exit blackbox.
All this was happening in etch and sarge too.
Martin