Re: Trying to make headway into finding the Xid crashes source...
I just put an XFX 6600GT in my AthlonMP box (Tyan Thunder K7). Its "locking" or "crashing" too. In reality its not really a crash at all, at some undetermined point X just seems to come unglued at goes 99% busy on a single proc (thanks to the dual procs it doesn't choke the system) and just chews away forever. If you attempt to kill the process it reattaches to 1 as a zombee and keeps chewing up CPU. You can't strace it because its all happening in userland.
I order to get around this problems I upgraded to the latest Xorg release (6.8.2), tried running a 2.4.30 kernel instead of 2.6.x, disabled VGA on the console completely, downgraded from NV driver 7174 to 6629, nothings worked. Sometimes it takes a dump after seconds, sometimes after hours, you can't tell. Generally it happens when you load images, such as in a browser. All you can do is log into the box from another system and reboot the box, you can't get X shutdown no matter what you try.
I haven't tried a driver older than 6629 yet but I probly should. I did disable Composite completely since some folks have suggested that caused problems but thats not helping either. When the card manages to stay up while I use 3D it works great, I've played Q3A and some mods, and play nicely at 1600x1200 and pretty smooth too, but X randomly freaking out on your just isn't practical. In the meantime I've reverted to the Xorg "nv" driver and I'm not having problems at all.
Dual AthlonMP 1.2G
1GB PC2100 Reg ECC
XFX 6600GT AGP
TrueCombat: Q3A Mod - truecombat.com