070603 Kevin O'Gorman wrote:
> From time to time my X server will lock up,
> usually but not always while I'm editing something in ooffice.
> It's always something that's pretty heavily graphical.
> When this happens, the only thing that still works on my desktop
> is mouse motion.  No clicks actually register
> and even the three-finger salutes (BS and DEL) are feckless.
> Can somebody help me stop and restart X?  I'm using kdm for login.

I've run into this too & had concluded it was minor defects in memory
brought about when the box heats a bit more than usual
(one memory bit's magnetism spills over into a neighbour).
I boot into a raw terminal, then start X with 'startx', 
so your problem probably has nothing to do with Kdm.

Your experience & a couple of earlier reports on the list
suggest there is an obscure bug somewhere in X ,
which would be very difficult to track down or even describe for bugzilla.
It seems unlikely to be a driver bug, as I've not changed cards recently.

I have just tested 'Alt-PrintScreen-K' -- press all simultaneously --
& it blanks the screen, after which I can use 'Ctl-Alt-F1'
to re-access the TTY, when 'Return' brings a terminal prompt
& I can restart X with 'startx' as usual (super-fast!);
this depends on enabling the 'magic SysRq' option in the kernel.
Of course, I don't know whether it will work next time X locks up (smile).

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