Describe the issue you are experiencing

I stumbled across #2611 while trying to figure out Bluetooth passthrough via Proxmox on my Beelink EQi12. While my Bluetooth adapter is different than the ones listed, I figured I'd give the steps @tommyjlong posted a shot. Unfortunately, I'm still running into errors related to missing firmware files.

Output of lsusb on Proxmox Host. 13d3:3621 is my Bluetooth adapter:

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 152d:a578 JMicron Technology Corp. / JMicron USA Technology Corp. SABRENT
Bus 001 Device 003: ID 13d3:3621 IMC Networks Wireless_Device
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Output of lspci suggests that this is a MediaTek 7920:

...
ac:00.0 Network controller: MEDIATEK Corp. Device 7920

Output of lsmod | grep bluetooth on Proxmox Host:

bluetooth             999424  4 btrtl,btmtk,btintel,btbcm
ecdh_generic           16384  1 bluetooth

Contents of /etc/modprobe.d/blacklist-bluetooth.conf

blacklist btrtl
blacklist btmtk
blacklist btintel
blacklist btbcm

Output of dmesg | grep -i bluetooth on HAOS VM:

[    2.762473] Bluetooth: Core ver 2.22
[    2.764900] NET: Registered PF_BLUETOOTH protocol family
[    2.767920] Bluetooth: HCI device and connection manager initialized
[    2.771420] Bluetooth: HCI socket layer initialized
[    2.773247] Bluetooth: L2CAP socket layer initialized
[    2.775280] Bluetooth: SCO socket layer initialized
[    2.786614] bluetooth hci0: Direct firmware load for mediatek/BT_RAM_CODE_MT7961_1a_2_hdr.bin failed with error -2
[    2.789020] Bluetooth: hci0: Failed to load firmware file (-2)
[    2.790547] Bluetooth: hci0: Failed to set up firmware (-2)
[    2.791953] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported.
[    4.473423] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    4.473425] Bluetooth: BNEP filters: protocol multicast
[    4.473428] Bluetooth: BNEP socket layer initialized

I have a firmware file called BT_RAM_CODE_MT7961_1_2_hdr.bin in /lib/firmware/mediatek, but I can't figure out how to symlink or copy the correct file into that directory since HAOS has a read-only filesystem. Is there something obvious I'm overlooking?

FWIW, I've also confirmed that the correct USB entry (13d3:3621) has been passed through to the VM from the Proxmox Host.

Thanks in advance for any help y'all can provide!

What operating system image do you use?

generic-x86-64 (Generic UEFI capable x86-64 systems)

What version of Home Assistant Operating System is installed?

6.12.51-haos

Did the problem occur after upgrading the Operating System?

No

Hardware details

• Beelink EQI12
• IMC Networks Wireless_Device Bluetooth device

Steps to reproduce the issue

See above.

Anything in the Supervisor logs that might be useful for us?

N/A

Anything in the Host logs that might be useful for us?

N/A

System information

System Information

Additional information

I went down a rabbit hole getting this working on my Proxmox Host first since this chip doesn't seem to like my Debian 12 kernel: https://forums.linuxmint.com/viewtopic.php?p=2598598#p2598598.