I'm wondering why video=viafb makes a difference for you as normally this gets 
autoloaded or doesn't react at all.
Does it work correctly if you add something like this instead?
video=viafb:viafb_active_dev=DVI,viafb_mode=800x480
Yeah, it might sound odd that its called 'DVI' but the whole output device 
setup is inside viafb and as far as I know in all free drivers a chaos at least.
Maybe openchrome assumes that the current setting is correct which is probably 
not the worst choice but should be avoided if possible. That said its probably 
a bug in viafb and in openchrome with viafb making the additional assumption 
that the output device is on VGA/CRT/primary output which is often correct but 
sometimes wrong. On the long term the whole output device setup mess has to be 
cleaned up but whether this is possible and how long it will take depends 
heavily on VIA and won't be finished under a year, I fear.

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Ubuntu 10.04 alpha 3 boot corrupts screen on VIA VX800 graphics (A110 netbook)
https://bugs.launchpad.net/bugs/538430
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