Pull up following revision(s) (requested by jmcneill in ticket #584):
external/mit/xorg-server/dist/Xext/sync.c: revision 1.2
xsync: Fix wakeup storm in idletime counter
Wakeup scheduling only considered the threshold values, and not whether
the trigger was edge or level.
See also:
https://bugzilla.redhat.com/show_bug.cgi?id=474586
http://svn.gnome.org/viewvc/gnome-screensaver/trunk/src/test-idle-ext.c?view=markup
Source:
http://cgit.freedesktop.org/xorg/xserver/commit/?id=1f4fb0225b278d1cf4145aebeb0bdd23dc8f62d5

(snj)