USB keyboard ate my Print Screen

[Stephen Borrill <netbsd%precedence.co.uk@localhost>]

I've a few different x86 netbsd-5 machines. Some have pkgsrc X.org, some 
are using in-tree X.org. Some are using xkb, some are using xmodmap. They 
do have one thing in common though, with a USB keyboard the "Print Screen" 
generates no events in xev. A PS/2 keyboard works fine.

ukbdmap.c places the wskbd PrintScreen symbol on usb keycode 70 and 
"wsconsctl -f /dev/wskbd1 map" shows Print_Screen is keycode 70.

Any clues?

--
Stephen