This bug is fixed in the current version of focal:
ubuntu@ubuntu:~$
ubuntu@ubuntu:~$ apt-cache policy linux-firmware-raspi2
linux-firmware-raspi2:
Installed: 4-0ubuntu0~20.04.1
Candidate: 4-0ubuntu0~20.04.1
Version table:
*** 4-0ubuntu0~20.04.1 500
500 http://ports.ubuntu.com/ubuntu-ports focal-updates/multiverse armhf
Packages
100 /var/lib/dpkg/status
1.20200212-0ubuntu1 500
500 http://ports.ubuntu.com/ubuntu-ports focal/multiverse armhf Packages
ubuntu@ubuntu:~$ cat /proc/device-tree/model; echo
Raspberry Pi Compute Module 4 Rev 1.0
ubuntu@ubuntu:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group
default qlen 1000
link/ether dc:a6:32:fe:ba:b0 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.56/24 brd 192.168.0.255 scope global dynamic eth0
valid_lft 42801sec preferred_lft 42801sec
inet6 fe80::dea6:32ff:fefe:bab0/64 scope link
valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default
qlen 1000
link/ether dc:a6:32:fe:ba:b1 brd ff:ff:ff:ff:ff:ff
ubuntu@ubuntu:~$
** Changed in: linux-firmware-raspi2 (Ubuntu)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/1912385
Title:
No wlan interfaces found on CM4 after firmware update
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