This type of problem is difficult to debug. Once you are out of
multiboot, the next code that touches the graphics adapter is
the vgatext driver. You can look at vgatext_attach(), in particular
vgatext_init(), to see if that's where things go wrong.

It's possible that some other hardware errors messing up
video display as a side effect. On one system, probing an empty
pci express bridge messes up the the display. I've also seen
BIOS incorrectly accounting for shadow memory, resulting in
shadow memory being used as normal ram. Video display is messed
up when the shadow memory is being stepped on.

I'd suggest you send the console to serial port and see if you
can get the machine up. You can then debug the video display
from the serial console.

Shudong

> 
> OK that did not work, unfortunately :( I still get the funky screen.
> 
> Any other ideas? What could cause this?
> 
> 
> Thank you very much,
> Alex Roman.
>  

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