unexpected logout

[Dj YB]

On Wednesday November 11 2009 08:44:22 Ed Greshko wrote:
> Dj YB wrote:
> > On Wednesday November 11 2009 00:55:45 Ed Greshko wrote:
> >> Tim wrote:
> >>> On Tue, 2009-11-10 at 22:26 +0200, Dj YB wrote:
> >>>> many times it happens to me that while working, suddenly the 
session
> >>>> just end and I get the kde welcome screen.
> >>>> I have tried to look for a way to understand what triggers this but
> >>>> with no luck, I have no idea where to look, what file logs this kind
> >>>> of events, how can I see what program/process caused the logout...?
> >>>
> >>> Hint:  ls /var/log/Xorg*
> >>>
> >>> If it bombed out while you were idle, the usual suspect is a screen
> >>> saver (a buggy one, or one finding a bug in your graphics driver).
> >>
> >> In addition, I had a power supply go wonky that ended up being the
> >> culprit.
> >
> > well, i am pretty curtain my power supply is good, but say I want to be
> > sure as to what caused the logout, where can I see which process \
> > application triggered it?
> > thanks
> 
> The point being made it that it is quite unlikely that a conventional,
> controlled logout has occurred.   Chances are good that the X server
> crashed or gdm crashed.  Those things that crash will not bring down the
> system but they will get restarted and present you with a login screen.
> This may lead you to conclude something logged you out.
> 
> Did you check the log as Tim suggested?
> 
yes, I didn't understand much
what should i look for?
thanks