David Dawes writes:
 > 
 > Does further switching give you a working XFree86 display again?  What
 > happens if you exit that XFree86 session and restart XFree86?
 > 
 > FWIW, when I was working in the driver, I wasn't able to reproduce any
 > switching-related problems with the hardware I had and the 4.3 version on
 > Linux, even after literally hundreds of switches.
 > 

On Linux the problems went away when moving the LpRing into the 'stolen
memory'. I had to do this for 855 and 865 also to fix this problem.
My impression was that when switching back to X the agp memory may
get mapped to different physical pages. The chipset didn't like this.
I don't recall exactly but I think I also got lockups when terminating
and restarting the server completely.


Egbert.
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