Re: [9front] igfx on haswell

[Kyle Milz <krwmilz@gmail.com>]

On Sat, Nov 13, 2021 at 10:42:17AM +0100, qwx@sciops.net wrote:
> Great, thanks!  For hdmi/dvi to work, igfx must manage to get
> an edid from the monitor, this doesn't happen with some of
> them, but you might coerce it to work with yet another vgadb
> entry for it, specifying a port with display=.  It will be on
> one of the 4 remaining DP ports, 4-7 (3 is eDP).  There's no
> way to force hdmi on a specific port though iirc.

i played around with aux/vga -pvV and it manages to get an edid
for the internal display about 1/10 of the time. the other 9/10
times the 8 edid header bytes contain random garbage. i tried
comparing i915 drm code with igfx.c to find out why but no luck.

i have not tried getting the edid from an external display but
suspect something similar is happening.

> If possible, please add the pci did to
> /sys/src/9/pc/vgaigfx.c:152.  The hardware cursor should be
> enabled when you invoke aux/vga.  If it's visible while
> /dev/vgactl shows `hwgc igfxhwgc', it works.

i tried that, but got the same output as before. forcing it with

	% echo hwgc igfxhwgc >/dev/vgactl

causes the cursor to disappear.

> One last thing, could you please also say if:
> 
> 	; ls '#g'

prints nothing.