the switch of gdm to upstart seemed to be a possible reason for this behaviour
change. maybe it's something else though..
anyway, the use of tcflush() in X was added by:
commit 446d9443cea31e493d05c939d0128a8116788468
Author: Adam Jackson <a...@redhat.com>
Date: Wed Nov 5 11:51:06 2008 -0500
linux: Drain the console fd of data when using evdev for keyboards
Works around a silly bug in the kernel that causes wakeup storms after
too many keypresses. Should fix the kernel bug too, but this at least
keeps the idle wakeup count below 1000/sec.
--
[karmic] Xorg 100% CPU utilization -- only after first login
https://bugs.launchpad.net/bugs/439138
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