Public bug reported:
Description:
The MediaTek Bluetooth adapter (USB ID 0489:e0cd, MT7921/MT7922) fails to
initialize on kernel 6.8.0-139-generic.
The device is detected on the USB bus via lsusb, but the interface remains
stuck in "DOWN INIT RUNNING" with BD Address 00:00:00:00:00:00.
Attempts to bring the interface up (hciconfig hci0 up) or unload modules
(modprobe -r btusb btmtk) result in an uninterruptible sleep state
(D-state) deadlock. Suspending the machine causes a hard freeze/black
screen due to the driver deadlock.
Regression details:
- Working version: linux-image-6.8.0-138-generic (Bluetooth initializes
properly, MAC address valid, works as expected)
- Broken version: linux-image-6.8.0-139-generic (Regression occurs here)
Hardware details:
- Subsystem: USB
- ID: 0489:e0cd Foxconn / Hon Hai MediaTek Bluetooth Adapter
- Motherboard: AMD B550 (ASUS PRIME B550M-K)
- Fast Startup on Windows is completely disabled.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-138-generic 6.8.0-138.138
ProcVersionSignature: Ubuntu 6.8.0-138.138-generic 6.8.12
Uname: Linux 6.8.0-138-generic x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Mon Sep 7 19:19:13 2026
InstallationDate: Installed on 2024-12-15 (631 days ago)
InstallationMedia: Kubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827)
MachineType: Gigabyte Technology Co., Ltd. B550M K
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-138-generic
root=UUID=47e57527-1655-40f4-b3a6-28f6470e345b ro quiet splash
resume=UUID=eaa5b8c1-6ef7-4775-9b1e-db4ac0af791c vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.8.0-138-generic N/A
linux-backports-modules-6.8.0-138-generic N/A
linux-firmware 20240318.git3b128b60.0ubuntu3.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/22/2024
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: FD
dmi.board.asset.tag: Default string
dmi.board.name: B550M K
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrFD:bd03/22/2024:br5.17:svnGigabyteTechnologyCo.,Ltd.:pnB550MK:pvr-CF:rvnGigabyteTechnologyCo.,Ltd.:rnB550MK:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:
dmi.product.family: B550 MB
dmi.product.name: B550M K
dmi.product.sku: Default string
dmi.product.version: -CF
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2166718
Title:
Regression: MediaTek Bluetooth (0489:e0cd) fails initialization (BD
Address 00:00:00:00:00:00) on kernel 6.8.0-139
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