[Bug 264300] Missing MEDIATEK MT7921 802.11ax PCI Express Wireless driver

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264300

--- Comment #37 from Thierry Thomas <thierry@FreeBSD.org> ---
I have a similar device on a laptop Acer Nitro ANV15-52.

During the installation (and then with fwget) this message is displayed:

Needed firmware packages: 'wifi-firmware-mt76-kmod-mt792x'
pkg: No packages available to install matching 'wifi-firmware-mt76-kmod-mt792x'
have been found in the repositories

I tried to manually install net/wifi-firmware-mt76-kmod but that does not
change anything.

1) pciconf -lv reports:
none7@pci0:63:0:0:      class=0x028000 rev=0x00 hdr=0x00 vendor=0x14c3
device=0x7920 subvendor=0x1a3b subdevice=0x6472
    vendor     = 'MEDIATEK Corp.'
    class      = network

2) Interesting lines of dmesg:

ugen1.4: <MediaTek Inc. WirelessDevice> at usbus1

ubt0 on uhub0
ubt0: <MediaTek Inc. WirelessDevice, class 239/2, rev 2.10/1.00, addr 3> on
usbus1
ubt1 on uhub0
ubt1: <MediaTek Inc. WirelessDevice, class 239/2, rev 2.10/1.00, addr 3> on
usbus1
ubt1: ubt_attach:681: could not get two interfaces
device_attach: ubt1 attach returned 6

3) usbconfig list
ugen0.1: <XHCI root HUB Intel> at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps)
pwr=SAVE (0mA)
ugen1.1: <XHCI root HUB Intel> at usbus1, cfg=0 md=HOST spd=SUPER (5.0Gbps)
pwr=SAVE (0mA)
ugen1.2: <Optical Mouse Sunplus Innovation Technology Inc.> at usbus1, cfg=0
md=HOST spd=LOW (1.5Mbps) pwr=ON (98mA)
ugen1.3: <ACER HD User Facing Quanta Computer, Inc.> at usbus1, cfg=0 md=HOST
spd=HIGH (480Mbps) pwr=ON (500mA)
ugen1.4: <WirelessDevice IMC Networks> at usbus1, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=ON (100mA)

4) devinfo -v
ubt0 <MediaTek Inc. WirelessDevice, class 239/2, rev 2.10/1.00, addr 3> pnpinfo
vendor=0x13d3 product=0x3622 devclass=0xef devsubclass=0x02 devproto=0x01
sernum="000000000" release=0x0100 mode=host intclass=0xe0 intsubclass=0x01
intprotocol=0x01 at bus=1 hubaddr=1 port=10 devaddr=4 interface=0 ugen=ugen1.4

If you need more details, or if I could help, you are welcome.

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