I have an 855GM chipset, info found in dmesg:
> agpgart: Detected an Intel 855GM Chipset.

I am not experiencing any gray block (I do experience some garbage
squares in the bottom-right of screen when the kernel is not configured
to use the proper framebuffer devices, but that's normal I guess), so my
problem was unrelated. I have no gray blocks when switching to VTs,
although sometimes when logging out from X the screen goes all black and
I can no more get a VT (I think this is unrelated too).

I do have a VGA output but couldn't yet test it; my problem was a
software problem (xfwm4 and gtk+), I am currently using the intel driver
(whose package is errenously labelled as "i810" on gentoo) with my 855GM
and everything is fine.

Best regards

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laptop hangs when switching video mode
https://bugs.launchpad.net/bugs/127101
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