MT7922 Bluetooth doesn't enable

[Martin Packwood]

martin@studio-as6:~$ sudo dmesg | egrep -i 'blue|firm'
[ 0.119642] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 0.278739] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 2.462372] [drm] Loading DMUB firmware via PSP: version=0x04000022
[ 2.463264] [drm] Found VCN firmware Version ENC: 1.21 DEC: 2 VEP: 0 Revision: 10
[ 2.463267] amdgpu 0000:e6:00.0: amdgpu: Will use PSP to load VCN firmware
[ 4.073508] Bluetooth: Core ver 2.22
[ 4.074051] NET: Registered PF_BLUETOOTH protocol family
[ 4.074053] Bluetooth: HCI device and connection manager initialized
[ 4.074057] Bluetooth: HCI socket layer initialized
[ 4.074059] Bluetooth: L2CAP socket layer initialized
[ 4.074064] Bluetooth: SCO socket layer initialized
[ 4.257367] mt7921e 0000:03:00.0: WM Firmware Version: ____000000, Build Time: 20220908203253
[ 6.223611] Bluetooth: hci0: Opcode 0x c03 failed: -110
[ 7.328550] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 7.328553] Bluetooth: BNEP filters: protocol multicast
[ 7.328556] Bluetooth: BNEP socket layer initialized

Note the line:
[ 6.223611] Bluetooth: hci0: Opcode 0x c03 failed: -110

UI carries on, but the error is fatal and no devices can be found.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: bluetooth (not installed)
ProcVersionSignature: Ubuntu 5.19.0-1017.18~22.04.1-lowlatency 5.19.17
Uname: Linux 5.19.0-1017-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sun Jun 25 14:25:34 2023
InstallationDate: Installed on 2023-06-25 (0 days ago)
InstallationMedia: Ubuntu-Studio 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230221)
InterestingModules: bnep bluetooth
MachineType: ASUSTeK COMPUTER INC. MINIPC PN53
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.19.0-1017-lowlatency root=UUID=933611e5-18b7-4290-98f3-d60eb962bdad ro threadirqs quiet splash vt.handoff=1
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: bluez
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/02/2023
dmi.bios.release: 2.3
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 20300
dmi.board.asset.tag: Default string
dmi.board.name: PN53
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 35
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr20300:bd02/02/2023:br2.3:svnASUSTeKCOMPUTERINC.:pnMINIPCPN53:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPN53:rvrRev1.xx:cvnDefaultstring:ct35:cvrDefaultstring:skuSKU:
dmi.product.family: Vivo PC
dmi.product.name: MINIPC PN53
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: ASUSTeK COMPUTER INC.
hciconfig:

rfkill:
 1: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no

[Jeremy (wa113y3s)]

Looks like the kernel needs this patch from upstream https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/drivers/bluetooth/btusb.c?id=57117d7234dadfba2a83615b2a9369f6f2f9914f

[Jeremy (wa113y3s)]

If you want to try my fix, Secure Boot needs to be disabled, check in terminal> mokutil --sb

Then in terminal
sudo apt install git dkms
git clone https://github.com/jeremyb31/bluetooth-5.19.git
sudo dkms add ./bluetooth-5.19
sudo dkms install btusb/4.0

Then reboot

[Martin Packwood (packwoodm)]

I followed dkms instructions. It works for me.

Many thanks for a swift resolution. Roughly a year quicker than Microsoft fixes. :)