Due to a missing brcmfmac43455-sdio.raspberrypi,4-compute-module.txt alias in linux-firmware-raspi2. The CM4's we'd encountered so far (and which had been tested for WiFi compatibility were all requesting brcmfmac43456-sdio.raspberrypi,4-compute-module.txt (note 43455 vs 43456) but it appears there's a couple of board revisions out there. I'll add the necessary alias in linux-firmware-raspi2 for hirsute, then we can see about SRU'ing this.
** Also affects: linux-firmware-raspi2 (Ubuntu Hirsute) Importance: Undecided Status: New ** Also affects: linux-raspi (Ubuntu Hirsute) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-raspi in Ubuntu. https://bugs.launchpad.net/bugs/1912905 Title: Can't find WLAN device on RPI-CM4L with 20.10 armhf preinstall server image Status in linux-firmware-raspi2 package in Ubuntu: New Status in linux-raspi package in Ubuntu: New Status in linux-firmware-raspi2 source package in Focal: New Status in linux-raspi source package in Focal: Confirmed Status in linux-firmware-raspi2 source package in Groovy: New Status in linux-raspi source package in Groovy: Confirmed Status in linux-firmware-raspi2 source package in Hirsute: New Status in linux-raspi source package in Hirsute: New Bug description: [Description] Can't find WLAN device on Raspberry Pi CM4L with 20.10 armhf preinstall server image. This only happens on armhf image. [Steps to reproduce] 1. Flash image http://cdimage.ubuntu.com/ubuntu/releases/groovy/release/ubuntu-20.10-preinstalled-server-armhf+raspi.img.xz 2. Boot into system 5. Check wireless device using "ip a" [Expected result] Can't find WLAN device [Actual result] WLAN device works fine [Additional information] Hardware: RPI-CM4L Kernel Version: 5.8.0-1006-raspi, 5.8.0-1012-raspi, 5.8.0-1013-raspi To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware-raspi2/+bug/1912905/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp