Re: [9front] strange behaviour of igfx and vesa

[cinap_lenrek@felloff.net]

very good. the gmbus stuff is for reading edid. if aux/vga -p prints the
edid, then this probably not the issue. but you are on the right track.

the theory is that igfx programs the registers right that it knows
about (check the load function), otherwise you wouldnt see a picture
at all. (igfx disables all the ports and then reprograms everything).
so the missing bits might not even be in the driver.

we'r looking for the needle in the haystack. if you have a clean bios
trace, then you can use the power of text processing and make a list
of all the wport mmio addresses for both igfx and bios. that way, you
can find registers that the igfx driver doesnt know about but are
programmed by the bios. then we can look them up in the intel docs
and figure out what they do :-)

good luck!

--
cinap