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On Thu, Mar 19, 2020 at 11:41:55PM +0200, 'Ilpo Järvinen' via qubes-users wrote:
> On Thu, 19 Mar 2020, Vít Šesták wrote:
> 
> > Hello,
> > I have some interesting updates. I have tried to:
> > 
> > a. Boot Fedora 31 on the laptop (Live version from USB drive) – adapter is
> > detected and finds Wi-Fi networks. It just works.
> > b. Boot Fedora 31 Live (from the same USB drive) in a HVM with attached
> > Wi-Fi card. It had 2000MiB of RAM. It fails in the same way as my previous
> > attempts, not sure why.
> > 
> > This looks like the AppVM is fine, but there is some glitch in the PCI
> > handling. It might be related to Xen or to the DM, not sure.
> > 
> > HVM: https://gist.github.com/v6ak/76f2c089c63b1fe184f3717d5bd5254e
> > sys-net with Fedora 31:
> > https://gist.github.com/v6ak/30ecc502d1ce7508953eb3d505564668
> > 
> > I have also resolved the chicken-egg problem – I can connect to the Internet
> > via USB. This is not a permanent solution, but it was good enough for
> > updating dom0. However, the update (+ subsequent reboot) has not changed
> > anything.
> 
> One option would be compile a kernel with CONFIG_IWLWIFI_TRACING (or 
> something like that) and try to provide the trace log to iwlwifi devs. 
> ...It might not help though if it's not a HW/driver issue but xen/dm/pci 
> related thing.

I've seen very similar thing recently, not sure if exactly the same, but
it's very likely.
Sad news is neither me nor Paweł managed to fix it yet.
Things we've tried:
 - various kernel versions (including 5.5 and 5.4)
 - different firmware versions (apparently the driver tries to load
   versions that new that are nowhere to be found yet)
 - various options like permissive mode

I didn't spot VT-d errors, but I'm not entirely sure if I've checked.
If they are there, this is something definitely worth looking into and
most likely an issue within iwlwifi driver (or the firmware). It could
be also worth trying booting Fedora 31 Live directly, but add
intel_iommu=on kernel option. If that would break it, it's a clear
indication that the issue is somewhere between firmware and the driver.

>> 1. Problem: Domain sys-net did not boot at all because of issues with 
>> attaching ethernet PCI device.

Is it a Realtek card? I don't remember exactly what helped, but
something helped here. Paweł, can you help?
It was either attaching SD card reader (which is another function on the
same PCI device) to the sys-net, or enabling no-strict-reset option (or
maybe permissive?).

- -- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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