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From: cinap_lenrek@felloff.net
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Subject: Re: [9front] installing 9front on Dell Optiplex 790
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monitor=vesa implies that aux/vga is using the vesa driver and *not*
the igfx driver.

if you set monitor to a entry in vgadb or in case of igfx, you
can set it to "auto" as the driver should detect the attached
monitors itself.

dump the registers and dump edid info of attached monitors:

aux/vga -m auto -p

then load a mode like:

aux/vga -m auto -l 1280x800x32

for this to work, the driver and the vgadb need to know the pci id.

so you need to add ctlr entry in vgadb like

ctlr
	vid=0x8086 did=0x0102	# Intel 2nd Gen Core
	link=vga
	ctlr=igfx linear=1

and in /sys/src/cmd/aux/vga/igfx.c:^devtype

static int
devtype(Igfx *igfx)
{
	if(igfx->pci->vid != 0x8086)
		return -1;
	switch(igfx->pci->did){
	case 0x0102:	/* 2nd Gen Core */
		return TypeSNB;
	...

documentation on the card can be found here:

https://01.org/linuxgraphics/documentation/driver-documentation-prms/2011-intel-core-processor-family

--
cinap