MT7612u wireless chipset not working on Raspberry Pi 400

[fauxsys]

I purchased the Alfa AWUS036ACM wireless adapter to use with my Raspberry Pi 400. The adapter works when using Raspberry Pi OS, but not when using "Ubuntu for Raspberry Pi" release 22.04. I have tested 64-bit variants for Ubuntu Desktop and Ubuntu Server, and the results are the same. I followed the Kernel Firmware Debugging steps, and included its output below. The LinuxWireless Debugging steps seem to only be appropriate if the wireless adapter is working to some capacity so the below output does not include those steps. I also attempted to follow the Kernel USB Debugging steps, but the commands do not seem appropriate for the Raspberry Pi 400. For example, `/proc/bus/usb` and `/sys/kernel/debug/usb/usbmon/` do not exist on the filesystem.

As part of troubleshooting, I updated the bootloader for the Raspberry Pi 400 to version 507b2360 which was built on 2022-04-26. I also ran `sudo apt update` and `sudo apt full-upgrade`. Neither of these troubleshooting steps resolved the problem.

On a separate note, I have another Ubuntu Server release 22.04 that is installed on dedicated hardware (not the "Ubuntu for Raspberry Pi" variant), and the wireless adapter does work on this machine.

#### Raspberry Pi 400 Output ####

$ sudo modprobe usbmon
modprobe: FATAL: Module usbmon not found in directory /lib/modules/5.15.0-1012-raspi

$ lsb_release -rd
Description: Ubuntu 22.04 LTS
Release: 22.04

$ apt-cache policy linux-firmware
linux-firmware:
  Installed: 20220329.git681281e4-0ubuntu3.2
  Candidate: 20220329.git681281e4-0ubuntu3.2
  Version table:
 *** 20220329.git681281e4-0ubuntu3.2 500
        500 http://ports.ubuntu.com/ubuntu-ports jammy-updates/main arm64 Packages
        100 /var/lib/dpkg/status
     20220329.git681281e4-0ubuntu1 500
        500 http://ports.ubuntu.com/ubuntu-ports jammy/main arm64 Packages

$ sudo udevadm control --log-priority debug

$ tail -f /var/log/syslog
Jul 22 20:56:03 ubuntu kernel: [ 533.687623] usb 2-1: new SuperSpeed USB device number 3 using xhci_hcd
Jul 22 20:56:03 ubuntu kernel: [ 533.709177] usb 2-1: New USB device found, idVendor=0e8d, idProduct=7612, bcdDevice= 1.00
Jul 22 20:56:03 ubuntu kernel: [ 533.709203] usb 2-1: New USB device strings: Mfr=2, Product=3, SerialNumber=4
Jul 22 20:56:03 ubuntu kernel: [ 533.709214] usb 2-1: Product: Wireless
Jul 22 20:56:03 ubuntu kernel: [ 533.709222] usb 2-1: Manufacturer: MediaTek Inc.
Jul 22 20:56:03 ubuntu kernel: [ 533.709230] usb 2-1: SerialNumber: 000000000
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1: Device is queued (SEQNUM=4179, ACTION=add)
Jul 22 20:56:03 ubuntu systemd-udevd[451]: Validate module index
Jul 22 20:56:03 ubuntu systemd-udevd[451]: Check if link configuration needs reloading.
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1: Device ready for processing (SEQNUM=4179, ACTION=add)
Jul 22 20:56:03 ubuntu systemd-udevd[451]: Successfully forked off 'n/a' as PID 1330.
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1: Worker [1330] is forked for processing SEQNUM=4179.
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Processing device (SEQNUM=4179, ACTION=add)
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Failed to get watch handle, ignoring: No such file or directory
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: /usr/lib/udev/rules.d/50-udev-default.rules:13 Importing properties from results of builtin command 'usb_id'
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1:1.0: Device is queued (SEQNUM=4180, ACTION=add)
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1:1.0: SEQNUM=4180 blocked by SEQNUM=4179
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1: Device is queued (SEQNUM=4181, ACTION=bind)
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1: SEQNUM=4181 blocked by SEQNUM=4179
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: /usr/lib/udev/rules.d/50-udev-default.rules:13 Importing properties from results of builtin command 'hwdb --subsystem=usb'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: hwdb modalias key: "usb:v0E8Dp7612:Wireless "
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: /usr/lib/udev/rules.d/50-udev-default.rules:50 MODE 0664
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: /usr/lib/udev/rules.d/60-drm.rules:3 Importing properties from results of builtin command 'path_id'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Setting permissions /dev/bus/usb/002/003, uid=0, gid=0, mode=0664
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Handling device node '/dev/bus/usb/002/003', devnum=c189:130
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: sd-device: Created db file '/run/udev/data/c189:130' for '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Failed to get watch handle, ignoring: No such file or directory
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Device processed (SEQNUM=4179, ACTION=add)
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: sd-device-monitor: Passed 900 byte to netlink monitor
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1:1.0: Device ready for processing (SEQNUM=4180, ACTION=add)
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1:1.0: sd-device-monitor: Passed 337 byte to netlink monitor
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1: SEQNUM=4181 blocked by SEQNUM=4180
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: Processing device (SEQNUM=4180, ACTION=add)
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: /usr/lib/udev/rules.d/50-udev-default.rules:14 Importing properties from results of builtin command 'hwdb --subsystem=usb'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: hwdb modalias key: "usb:v0E8Dp7612d0100dc00dsc00dp00icFFiscFFipFFin00"
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: /usr/lib/udev/rules.d/60-drm.rules:3 Importing properties from results of builtin command 'path_id'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: /usr/lib/udev/rules.d/80-drivers.rules:5 RUN 'kmod load '$env{MODALIAS}''
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: sd-device: Created db file '/run/udev/data/+usb:2-1:1.0' for '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1/2-1:1.0'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: Running built-in command "kmod load 'usb:v0E8Dp7612d0100dc00dsc00dp00icFFiscFFipFFin00'"
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: Loading module: usb:v0E8Dp7612d0100dc00dsc00dp00icFFiscFFipFFin00
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: Failed to find module 'usb:v0E8Dp7612d0100dc00dsc00dp00icFFiscFFipFFin00'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: Device processed (SEQNUM=4180, ACTION=add)
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1:1.0: sd-device-monitor: Passed 580 byte to netlink monitor
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1: Device ready for processing (SEQNUM=4181, ACTION=bind)
Jul 22 20:56:03 ubuntu systemd-udevd[451]: 2-1: sd-device-monitor: Passed 328 byte to netlink monitor
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Processing device (SEQNUM=4181, ACTION=bind)
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Failed to get watch handle, ignoring: No such file or directory
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: /usr/lib/udev/rules.d/50-udev-default.rules:13 Importing properties from results of builtin command 'usb_id'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: /usr/lib/udev/rules.d/50-udev-default.rules:13 Importing properties from results of builtin command 'hwdb --subsystem=usb'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: hwdb modalias key: "usb:v0E8Dp7612:Wireless "
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: /usr/lib/udev/rules.d/60-drm.rules:3 Importing properties from results of builtin command 'path_id'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Handling device node '/dev/bus/usb/002/003', devnum=c189:130
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: sd-device: Created db file '/run/udev/data/c189:130' for '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1'
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Failed to get watch handle, ignoring: No such file or directory
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: Device processed (SEQNUM=4181, ACTION=bind)
Jul 22 20:56:03 ubuntu systemd-udevd[1330]: 2-1: sd-device-monitor: Passed 901 byte to netlink monitor
Jul 22 20:56:07 ubuntu systemd-udevd[451]: Cleanup idle workers
Jul 22 20:56:07 ubuntu systemd-udevd[1330]: Unload module index
Jul 22 20:56:07 ubuntu systemd-udevd[1330]: Unloaded link configuration context.
Jul 22 20:56:07 ubuntu systemd-udevd[451]: Worker [1330] exited

$ udevadm monitor --property
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[575.955014] add /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1 (usb)
ACTION=add
DEVPATH=/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1
SUBSYSTEM=usb
DEVNAME=/dev/bus/usb/002/004
DEVTYPE=usb_device
PRODUCT=e8d/7612/100
TYPE=0/0/0
BUSNUM=002
DEVNUM=004
SEQNUM=4185
MAJOR=189
MINOR=131

KERNEL[575.965837] add /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1/2-1:1.0 (usb)
ACTION=add
DEVPATH=/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1/2-1:1.0
SUBSYSTEM=usb
DEVTYPE=usb_interface
PRODUCT=e8d/7612/100
TYPE=0/0/0
INTERFACE=255/255/255
MODALIAS=usb:v0E8Dp7612d0100dc00dsc00dp00icFFiscFFipFFin00
SEQNUM=4186

KERNEL[575.966265] bind /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1 (usb)
ACTION=bind
DEVPATH=/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1
SUBSYSTEM=usb
DEVNAME=/dev/bus/usb/002/004
DEVTYPE=usb_device
DRIVER=usb
PRODUCT=e8d/7612/100
TYPE=0/0/0
BUSNUM=002
DEVNUM=004
SEQNUM=4187
MAJOR=189
MINOR=131

UDEV [575.975764] add /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1 (usb)
ACTION=add
DEVPATH=/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1
SUBSYSTEM=usb
DEVNAME=/dev/bus/usb/002/004
DEVTYPE=usb_device
PRODUCT=e8d/7612/100
TYPE=0/0/0
BUSNUM=002
DEVNUM=004
SEQNUM=4185
USEC_INITIALIZED=575974968
ID_VENDOR=MediaTek_Inc.
ID_VENDOR_ENC=MediaTek\x20Inc.
ID_VENDOR_ID=0e8d
ID_MODEL=Wireless
ID_MODEL_ENC=Wireless\x20
ID_MODEL_ID=7612
ID_REVISION=0100
ID_SERIAL=MediaTek_Inc._Wireless_000000000
ID_SERIAL_SHORT=000000000
ID_BUS=usb
ID_USB_INTERFACES=:ffffff:
ID_VENDOR_FROM_DATABASE=MediaTek Inc.
ID_MODEL_FROM_DATABASE=MT7612U 802.11a/b/g/n/ac Wireless Adapter
ID_PATH=platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1
ID_PATH_TAG=platform-fd500000_pcie-pci-0000_01_00_0-usb-0_1
DRIVER=usb
ID_FOR_SEAT=usb-platform-fd500000_pcie-pci-0000_01_00_0-usb-0_1
MAJOR=189
MINOR=131
TAGS=:seat:
CURRENT_TAGS=:seat:

UDEV [575.983943] add /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1/2-1:1.0 (usb)
ACTION=add
DEVPATH=/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1/2-1:1.0
SUBSYSTEM=usb
DEVTYPE=usb_interface
PRODUCT=e8d/7612/100
TYPE=0/0/0
INTERFACE=255/255/255
MODALIAS=usb:v0E8Dp7612d0100dc00dsc00dp00icFFiscFFipFFin00
SEQNUM=4186
USEC_INITIALIZED=575983144
ID_VENDOR_FROM_DATABASE=MediaTek Inc.
ID_MODEL_FROM_DATABASE=MT7612U 802.11a/b/g/n/ac Wireless Adapter
ID_PATH=platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1:1.0
ID_PATH_TAG=platform-fd500000_pcie-pci-0000_01_00_0-usb-0_1_1_0
.MM_USBIFNUM=00

UDEV [575.991091] bind /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1 (usb)
ACTION=bind
DEVPATH=/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb2/2-1
SUBSYSTEM=usb
DEVNAME=/dev/bus/usb/002/004
DEVTYPE=usb_device
DRIVER=usb
PRODUCT=e8d/7612/100
TYPE=0/0/0
BUSNUM=002
DEVNUM=004
SEQNUM=4187
USEC_INITIALIZED=575974968
ID_VENDOR=MediaTek_Inc.
ID_VENDOR_ENC=MediaTek\x20Inc.
ID_VENDOR_ID=0e8d
ID_MODEL=Wireless
ID_MODEL_ENC=Wireless\x20
ID_MODEL_ID=7612
ID_REVISION=0100
ID_SERIAL=MediaTek_Inc._Wireless_000000000
ID_SERIAL_SHORT=000000000
ID_BUS=usb
ID_USB_INTERFACES=:ffffff:
ID_VENDOR_FROM_DATABASE=MediaTek Inc.
ID_MODEL_FROM_DATABASE=MT7612U 802.11a/b/g/n/ac Wireless Adapter
ID_PATH=platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1
ID_PATH_TAG=platform-fd500000_pcie-pci-0000_01_00_0-usb-0_1
ID_FOR_SEAT=usb-platform-fd500000_pcie-pci-0000_01_00_0-usb-0_1
MAJOR=189
MINOR=131
TAGS=:seat:
CURRENT_TAGS=:seat:

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-firmware 20220329.git681281e4-0ubuntu3.2
ProcVersionSignature: Ubuntu 5.15.0-1012.14-raspi 5.15.39
Uname: Linux 5.15.0-1012-raspi aarch64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k5.15.0-1012-raspi.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: arm64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
CasperMD5CheckResult: unknown
Date: Fri Jul 22 20:52:15 2022
Dependencies: firmware-sof-signed 2.0-1ubuntu3
ImageMediaBuild: 20220419
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci-vt: -[0000:00]---00.0-[01]----00.0 VIA Technologies, Inc. VL805/806 xHCI USB 3.0 Controller
PackageArchitecture: all
PciMultimedia:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=C.UTF-8
 SHELL=/bin/bash
ProcFB: 0 BCM2708 FB
ProcKernelCmdLine: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=1920 bcm2708_fb.fbheight=1080 bcm2708_fb.fbswap=1 smsc95xx.macaddr=E4:5F:01:CA:5A:4D vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyS0,115200 dwc_otg.lpm_enable=0 console=tty1 root=LABEL=writable rootfstype=ext4 rootwait fixrtc quiet splash
RelatedPackageVersions:
 linux-restricted-modules-5.15.0-1012-raspi N/A
 linux-backports-modules-5.15.0-1012-raspi N/A
 linux-firmware 20220329.git681281e4-0ubuntu3.2
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux-firmware
StagingDrivers: snd_bcm2835 vc_sm_cma bcm2835_mmal_vchiq bcm2835_v4l2 bcm2835_codec bcm2835_isp
UpgradeStatus: No upgrade log present (probably fresh install)
acpidump:

[Dave Jones (waveform)]

Looks like this is one of the ones moved to the modules-extra package (this split is kernel specific, and wasn't done on the PC kernel which probably explains why this adapter works on your PC installation of Ubuntu Server). If you do the following:

  $ sudo apt install linux-modules-extra-raspi

You should then be able to modprobe usbmon. I'll move the bug over to linux-raspi as it's technically a kernel issue.

[fauxsys (fauxsys)]

Incredible, thank you for the fast response, Dave! Installing the linux-modules-extra-raspi package did indeed allow me to modprobe usbmon, and the Wireless AP to be recognized by `iw list`.

[fauxsys (fauxsys)]

Hi Juerg, can you explain why this is now invalid?