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On Thu, Aug 11, 2022 at 11:30:50AM +0200, Martin Holst Swende wrote:
> 
> On 8/11/22 10:59, Demi Marie Obenour wrote:
> > 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.
> > 
> I have tested this now. When I boot, the problem remains. Opening the Qube
> Manager shows that the sys-gui-gpu qube is not running. I tried starting it
> from the manager,
> and it led to immediate black screen, requiring a hard shutdown. The logs
> for that qube are here:

dom0 will kernel panic if the GPU is removed from it while in use.  I
recommend preventing the i915 kernel module from being loaded in dom0
via the dom0 kernel command line.
- -- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
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