For some reason, WiFi now worked
I can't believe that my builtin Mediatek WiFi [14c3:7920] is now working in my AMD ANV15-41 notebook.
I had the pre-installed mt7xxx-firmware package but it wasn't recognizing. Tried to create a persistent sys-net but nothing.
In PCI passthrough at qube configuration, the device is shown only as "Network controller: MEDIATEK Corp."
Tested a USB dongle, and that worked1.
But then, for a unknown reason, rebooting the QubesOS after setupping a TemplateVM and an AppVM with ethernet cable, it now got recognized.
I don't know/remember if I did anything to solve, maybe it was the system update I ran via Qubes Update app.