Leo adding vmalloc=268435456 to the line with "quite splash" was what I wanted, 
thanks. But your syslog missed any reference to viafb even the startup message 
(probably it didn't get written to disk prior to freeze) so I didn't see 
anything in there.
Anyway by using the fact that
- the very same IGP works for some people
- the crash happens very early (even when the module refuses to work) but seems 
to also happen if it would likely work (with the vmalloc option)
I can think only of one code area, the I2C code, that could cause this as the 
rest are fairly simple PCI commands. Maybe the manufacturers of your boards did 
some strange things as is done in OLPC (where this just causes half a minute 
delay). But maybe I'm just missing something obvious here.
However debugging this and finding the right fix will be something that takes a 
while (and a lot of help from people who experience this bug). There is a 
slight chance (although relatively low) that this will be fixed in 2.6.35-rc2 
as Jon posted some changes to the I2C code (not explicitly labled as fixes so 
don't expect too much).
It also could be helpful if somebody would test Harald's old tree, located at
http://git.gnumonks.org/cgi-bin/gitweb.cgi?p=linux-2.6-via.git;a=shortlog;h=refs/heads/via-viafb
but I do not expect it to work any better (although it did sometimes in the 
past). If I knew that this does not work I could ask him for help as he has 
better connections to VIA and is more experienced than me. So if you want to 
give it a try this might be a starting point
https://wiki.ubuntu.com/KernelTeam/KnowledgeBase
I won't provide any help in compiling and installing your own test kernel as my 
advice would likely lead to screwing your system up.
Sorry that I can't be a big help but there is not much I can do without knowing 
what exactly goes wrong and therefore prefer to concentrate on the things I can 
actually do without too much guesswork.

-- 
Unable start as live cd Lucid Beta 2
https://bugs.launchpad.net/bugs/558569
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