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[Bug 439138] Re: [karmic] Xorg 100% CPU utilization -- only after first login

 

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 <ajax@xxxxxxxxxx>
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.

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[karmic] Xorg 100% CPU utilization -- only after first login
https://bugs.launchpad.net/bugs/439138
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