This bug has been annoying me since 1004 (910 was ok). As long as I remember, 
the bug was in xorg package. I can't provide you with the number, but the 
sudden logout occurred due to something like switching to an empty 
thread/socket (?). On my nvidia ION nettop sudden logouts happened frequently 
with compiz on, less frequently with compiz off, and almost instantly while 
using Firefox on certain sites (for example, maps.yandex.ru, because in my 
opinion there are many switchings of graphics threads/sockets).
The correction was made to first check if the thread/socket we are going to 
switch to is empty. 1010 comprised newer X version which included this 
correction, thus there were no sudden logouts at all.
Now in 1104 the bug is back. This time though, I experienced sudden logout only 
once and not on ION (gave it away) but on another pc, supposedly my desktop (it 
is nvidia-based). My intel-based netbook seems to be ok with 1104.

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/783002

Title:
  Auto logoff ubuntu 11.04

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