Unfortunately, gnome-screensaver checks the X event queue to determine when an
event occurs, and most joystick using programs in ubuntu use the kernel event
interface (or legacy /dev/js0) from libsdl.
Regarding the mouse scroll, there is a limitation in X that only one client may
trap button clicks at a time, so gnome-screensaver must ignore them in order to
allow the program to see them. This is also annoying upstream (see
src/gs-watcher-x11.c for the rant).
** Changed in: gnome-screensaver (Ubuntu)
Status: Unconfirmed => Confirmed
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Joystick activity does not stop the screensaver
https://launchpad.net/bugs/30378
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