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.

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