[18.04.3] WLAN device disappear after upgrading linux-firmware-raspi2

[Gavin Lin]

[Description]
WLAN device disappear after upgrading linux-firmware-raspi2
Package Version: 1.20200601+arm64-0ubuntu2~18.04.1 [upgradable from: 1.20190215-0ubuntu0.18.04.1]

[Steps to reproduce]
1. Flash image http://old-releases.ubuntu.com/releases/bionic/ubuntu-18.04.3-preinstalled-server-arm64+raspi3.img.xz
2. Boot into system
3. Upgrade linux-firmware-raspi2
4. Reboot the system
5. Check wireless device using "ip a"

[Actual result]
WLAN device disappear after upgrading linux-firmware-raspi2

[Expected result]
WLAN device works fine

[Additional information]
Hardware: rpi3b, rpi3b+, rpi3a+
Kernel Version: 4.15.0-1077-raspi2

[Varisht Ghedia (varishtsg)]

Facing the same issue on rpi 4b.

[Gavin Lin (gavin.lin)]

Hi Varisht, rpi4b is not supported by this 4.15 kernel, please try ubuntu 18.04.6 or 20.04 image:

https://ubuntu.com/download/raspberry-pi

[Dave Jones (waveform)]

Is this still an issue? I vaguely recall replicating this, but running out of time to dig into the causes. Given bionic is now EOL I'm tempted to mark this won't fix given I'm not aware of wifi issues on the still-supported releases, but I'll mark it incomplete for now.