Back again with more information:
I am definately using the latest BIOS Version which is 5.9 from award BIOS
The most recent Kernel of the ubuntu breezy distro is 2.6.12-10-k7 which I am using atm.
I played ET just few minutes ago and the crash did happen again:
Mar 17 17:32:02 localhost kernel: [4295023.640000] eth1: no IPv6 routers presentMar 17 17:46:53 localhost -- MARK --
Mar 17 17:48:54 localhost kernel: [4296035.230000] NVRM: Xid: 6, PE0002 180c 0028002f 0010fe8c f000ef6f f000e987
Mar 17 17:48:54 localhost kernel: [4296035.232000] NVRM: Xid: 27, L1 -> L0
Mar 17 17:48:54 localhost kernel: [4296035.713000] NVRM: Xid: 6, PE0000 180c 00a400a2 00008d6c 00000000 00000000
Mar 17 17:48:54 localhost kernel: [4296035.714000] NVRM: Xid: 27, L1 -> L0
Mar 17 17:52:02 localhost syslogd 1.4.1#17ubuntu3: restart.
I have tried playing ET without SBA/FastWrite but the result is that I could only use ca 30 FPS which is not enough to play 20 minutes and wait for a crash - I dont know how to reproduce this in any other way. So called Atlantis Screensaver (GL)did run for quite a while without a crash.
Is there anything else I can do?
PS: I read about VIA chipset mainboards which dont work well with agp 8x. Should I try using different agp speed, though its a nforce2 chipset?