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On Thu, Aug 11, 2022 at 09:07:22AM +0200, Martin Holst Swende wrote:
> 
> > > Happy to try out any suggestion/experiment.
> > 
> > 1. Does i915.enable_psr2_sel_fetch=0 help?
> 
> No, no change that I can see.

Okay, so that is not the problem.

> > 2. What X11 driver is Xorg using?  If it is using Intel, does
> >    modesetting help?  If it is using modesetting, does Intel help?
> 
> 
> More full logs/notes can be found at 
> https://gist.github.com/holiman/83c76e4cd98d087719773486a77d9112#file-dom0_testing-txt
> .
> 
> I'm not sure how to interpret the logs, it looks to me like "intel no,
> modesetting yes". Not sure how/what to change here, given a nudge in the
> right direction I can try to explore it more.

That is what it looks like to me also.

> > 3. Does HVM sys-gui-gpu work?  What about PV (not PVH!) sys-gui-gpu?
> 
> I don't have a sys-gui-gpu at the moment, but will test that. This page
> (https://www.qubes-os.org/doc/guivm-configuration/) is still the most
> relevant/recent description, right?

I think so?  I don’t use sys-gui-gpu myself, and I will admit that there
are quite a few bugs when using it.  Still, if it works, then the
possible parts of the code that could be to blame is much lower.  If
sys-gui-gpu in PV mode works, then the problem is almost certainly the
userspace drivers (Mesa).  If sys-gui-gpu in HVM mode works, but it
fails in PV mode, then the problem is likely in the way i915 and Xen
interact.

> > If PV sys-gui-gpu with a dom0-provided kernel works, then the problem is
> > almost certainly old dom0 userspace: either an old X server, old Mesa,
> > or both.  If you could build modern Mesa and/or X11 for dom0 and try
> > again, that would be awesome.
> 
> Left for future reference, I'm taking baby steps here :)

Valid :)

- -- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
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