Public bug reported:
After upgrading from 6.8.0-138 to 6.8.0-139, Bluetooth (MT7922 MediaTek
adapter) fails to initialize with a kernel NULL pointer dereference at
address 0x219 in btmtk_usb_hci_wmt_sync+0xa9. The bug persists in
6.8.0-142. Rolling back to 6.8.0-138 restores Bluetooth functionality.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-142-generic 6.8.0-142.142
ProcVersionSignature: Ubuntu 6.8.0-142.142-generic 6.8.12
Uname: Linux 6.8.0-142-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version
k6.8.0-142-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Card1.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card1.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Card2.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card2.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Card3.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card3.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Card4.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card4.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
CurrentDmesg:
Error: command ['pkexec', 'dmesg'] failed with exit code 127: Error executing
command as another user: Not authorized
This incident has been reported.
Date: Fri Sep 25 23:50:48 2026
InstallationDate: Installed on 2025-06-30 (453 days ago)
InstallationMedia: Ubuntu-Server 24.04.2 LTS "Noble Numbat" - Release amd64
(20250216.2)
MachineType: ASUS System Product Name
ProcFB: 0 nvidia-drmdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-142-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.8.0-142-generic N/A
linux-backports-modules-6.8.0-142-generic N/A
linux-firmware 20240318.git3b128b60.0ubuntu3.1
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
acpidump:
Error: command ['pkexec', '/usr/share/apport/dump_acpi_tables.py'] failed with
exit code 127: Error executing command as another user: Not authorized
This incident has been reported.
dmi.bios.date: 07/21/2025
dmi.bios.release: 32.79
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3279
dmi.board.asset.tag: Default string
dmi.board.name: PRIME B650-PLUS WIFI
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr3279:bd07/21/2025:br32.79:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEB650-PLUSWIFI:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: ASUS
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2168600
Title:
btmtk_usb_hci_wmt_sync NULL pointer dereference breaks MT7922
Bluetooth
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