Public bug reported:
System: Ubuntu 24.04.4 LTS, ASUS Vivobook 15 X1504ZA. Bluetooth adapter is a
MediaTek MT7902 combo chip (mt7902e, AzureWave, PCIe with an internal USB
bridge for the BT interface), hci0, MAC A8:E2:91:29:54:B3.
Bluetooth fails to initialize on cold boot with kernel
6.17.0-40-generic. Kernel log shows:
Bluetooth: hci0: Opcode 0x0c03 failed: -110
This is an HCI Reset command timeout (ETIMEDOUT). hci0 never comes up,
BD Address stays 00:00:00:00:00:00, controller state stays DOWN,
bluetoothctl reports no default controller. bluetoothd itself starts
cleanly — the failure is below the daemon, at the controller/firmware
level.
Booting the same hardware into kernel 6.17.0-35-generic, with no other
configuration changes, Bluetooth initializes cleanly on cold boot every
time.
Wi-Fi on the same MT7902 combo chip is unaffected on either kernel,
since it runs through a separate out-of-tree DKMS driver with its own
firmware/init path. Bluetooth runs through the in-tree btusb/btmtk
stack, which changed between these two kernel builds. This isolates the
regression to that in-tree stack rather than the hardware or firmware
files.
Full kernel log from the affected boot (6.17.0-40-generic) plus lspci
-nnk output for the Bluetooth device is attached
(bt-6170-40-regression.txt).
Workaround in place: pinned to 6.17.0-35-generic via GRUB_DEFAULT=saved
and apt-mark hold on linux-image-6.17.0-35-generic.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-35-generic 6.17.0-35.35~24.04.1
ProcVersionSignature: Ubuntu 6.17.0-35.35~24.04.1-generic 6.17.13
Uname: Linux 6.17.0-35-generic x86_64
ApportVersion: 2.28.2-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: caffeine 1928 F.... wireplumber
/dev/snd/seq: caffeine 1921 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul 15 16:34:57 2026
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 2b7e:b868 Sonix Technology Co., Ltd. ASUS HD webcam
Bus 001 Device 003: ID 13d3:3579 IMC Networks Wireless_Device
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: ASUSTeK COMPUTER INC. Vivobook_ASUSLaptop X1504ZA_X1504ZA
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.17.0-35-generic
root=UUID=4c8e7f51-2127-4936-bd71-8ee73735deb2 ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.17.0-35-generic N/A
linux-backports-modules-6.17.0-35-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.27
SourcePackage: linux-hwe-6.17
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/20/2024
dmi.bios.release: 5.27
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: X1504ZA.313
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X1504ZA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrX1504ZA.313:bd03/20/2024:br5.27:svnASUSTeKCOMPUTERINC.:pnVivobook_ASUSLaptopX1504ZA_X1504ZA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX1504ZA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:
dmi.product.family: Vivobook
dmi.product.name: Vivobook_ASUSLaptop X1504ZA_X1504ZA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
** Affects: linux-hwe-6.17 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
** Attachment added: "bt-6170-40-regression.txt"
https://bugs.launchpad.net/bugs/2160716/+attachment/5982043/+files/bt-6170-40-regression.txt
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https://bugs.launchpad.net/bugs/2160716
Title:
Bluetooth hci0 HCI Reset (0x0c03) fails on 6.17.0-40-generic, works on
6.17.0-35-generic — MT7902/mt7902e
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