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Date: Mon, 17 Apr 2023 10:06:28 +0200
From: qwx@sciops.net
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Subject: Re: [9front] Screen resolution
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On Sun Apr 16 18:05:12 +0200 2023, ng@0x80.stream wrote:
> Hi all,
> 
> this weekend I moved from a RPi 2B+ to an Intel NUC.  Recent
> discussions on this list motivated me to finally try that move.  My
> only problem is that I can't seem to change screen resolution from
> monitor=vesa vgasize=1024x768x16.
> 
> My sysinfo is at http://sysinfo.9front.org/src/498/body and the
> relevant bits, I think, are:
[...]
> @{ rfork n; aux/realemu; aux/vga -m igfx -l 3840x2160@30Hz }

Same as unobe, you don't need to run aux/realemu unless you're using
vesa.  Also same as them, you have an ivybridge machine which I assume
is connected via displayport.  If it's hdmi, you are out of luck for
now.  igfx manages to snarf the monitor's edid, so you should be able
to just use `monitor=auto' in plan9.ini or for your command line, and
you don't need to deal with /lib/vgadb at all.  Therefore, I think
your problem is the same as unobe's, please try again with the patch
they sent earlier, at this point there's a good chance that it would
work.


> Some more guesswork.  /lib/vgadb:/0166/ makes me think the controller
> entry is already present.  Perhaps then I need an entry describing the
> monitor?  I guessed the edid output could be used here, so I added
> 
> mymon=3840x2160@30Hz 
> 		clock=297
> 		shb=4016 ehb=4104 ht=4400
> 		vrs=2168 vre=2178 vt=2250
> 		hsync=+ vsync=+ 

Don't mash buttons!  This alone would not work as this entry would
attempt to configure the vga port.  If aux/vga failed to snarf the
edid, you would have to add a display=N here, where N is a number
between 3 and 7 for DP ports A to E. Obtuse, but that's how it works
right now.  I refer you to my (crappy) old post [1] describing all of
this.  It needs to be rewritten, but it covers most of the steps.

So, try the patch, and let's hope that it's enough, otherwise more
weird crap is missing.

Cheers,
qwx


[1] http://nopenopenope.net/posts/igfx