Public bug reported:
Hardware:
Motherboard: MSI B650 GAMING PLUS WIFI
Wireless chip: MediaTek MT7922 (PCIe, mt7921e driver)
Kernels tested: 6.8.0-124-generic, 6.17.0-35-generic, 6.17.0-1025-oem
Problem:
Bluetooth is completely non-functional. The MT7922 chip never exposes a
Bluetooth USB device and never requests BT firmware
(BT_RAM_CODE_MT7922_1_1_hdr.bin.zst), despite the firmware file being present
in /lib/firmware/mediatek/.
Symptoms:
lsusb shows no MediaTek Bluetooth device
dmesg shows mt7921e loading only WiFi firmware (WM Firmware Version:
____000000), BT firmware never requested
bluetooth.service stays inactive/dead — no HCI controller found
bluetoothctl list returns "No default controller available"
No btmtk or BT-related entries in dmesg at any point
Steps tried:
Installed/reinstalled bluez, bluetooth, linux-firmware packages
Manually loaded btmtk, btusb modules
Removed entire mt76 stack (mt7921e, mt7921_common, mt792x_lib, mt76_connac_lib,
mt76) and reloaded — BT USB device appeared once but never reproducibly again
Added softdep mt7921e pre: btmtk btusb to /etc/modprobe.d/mt7921e.conf
Created systemd service to reload mt76 stack at boot — service ran successfully
but BT device never appeared
Upgraded to kernel 6.17.0-35-generic (HWE) — same result
Upgraded NVIDIA driver to 595-open to unblock kernel upgrade
Tried kernel 6.17.0-1025-oem — same result
Disabled Secure Boot — no change
Confirmed BT_RAM_CODE_MT7922_1_1_hdr.bin.zst is present but never loaded by
driver
Conclusion:
The mt7921e driver does not initialize the Bluetooth coprocessor for the MT7922
chip revision (ASIC revision: 79220010). The driver loads only WiFi firmware
and never attempts to bring up the BT side, regardless of module load order or
kernel version.
Relevant dmesg:
mt7921e 0000:0d:00.0: ASIC revision: 79220010
mt7921e 0000:0d:00.0: WM Firmware Version: ____000000, Build Time:
20250523103234
No BT firmware load, no HCI device registration.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-1025-oem 6.17.0-1025.25
ProcVersionSignature: Ubuntu 6.17.0-1025.25-oem 6.17.13
Uname: Linux 6.17.0-1025-oem x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Jun 16 00:14:52 2026
InstallationDate: Installed on 2023-12-04 (924 days ago)
InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64
(20230807.2)
MachineType: Micro-Star International Co., Ltd. MS-7E26
ProcFB: 0 nvidia-drmdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.17.0-1025-oem
root=/dev/mapper/vgubuntu-root ro quiet splash clearcpuid=304 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.17.0-1025-oem N/A
linux-backports-modules-6.17.0-1025-oem N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.27
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux-oem-6.17
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/10/2023
dmi.bios.release: 5.26
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: 1.30
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: B650 GAMING PLUS WIFI (MS-7E26)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvr1.30:bd08/10/2023:br5.26:svnMicro-StarInternationalCo.,Ltd.:pnMS-7E26:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB650GAMINGPLUSWIFI(MS-7E26):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:skuTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7E26
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.
** Affects: linux-oem-6.17 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2156818
Title:
Bluetooth does not work consistently.
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