Public bug reported:
The Bluetooth adapter on my Lenovo ThinkPad E15 Gen 4 is not detected in
Ubuntu 24.04. The Wi-Fi on the same MediaTek MT7921 card works
perfectly.
The core issue is that the kernel does not create the
/sys/class/bluetooth directory, which causes the bluetooth.service to be
skipped with the condition
ConditionPathIsDirectory=/sys/class/bluetooth.
Troubleshooting Steps Performed:
Confirmed no hardware/software blocks with rfkill.
System is fully updated as of (add today's date).
There is no Windows dual boot, so "Fast Startup" is not a factor.
Manually installed the latest firmware from linux-firmware.git and rebooted.
The dmesg log shows the mt7921e driver loading for Wi-Fi, but there are no
errors or initialization attempts for the Bluetooth component.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.11.0-26-generic 6.11.0-26.26~24.04.1
ProcVersionSignature: Ubuntu 6.11.0-26.26~24.04.1-generic 6.11.11
Uname: Linux 6.11.0-26-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: antonio-murteira 2680 F.... wireplumber
/dev/snd/controlC0: antonio-murteira 2680 F.... wireplumber
/dev/snd/seq: antonio-murteira 2675 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri May 23 10:13:39 2025
InstallationDate: Installed on 2024-10-04 (231 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827.1)
MachineType: LENOVO 21EDCTO1WW
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.11.0-26-generic
root=UUID=387d160b-e87a-4fd5-831d-2375809d41a7 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.11.0-26-generic N/A
linux-backports-modules-6.11.0-26-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.11
SourcePackage: linux-hwe-6.11
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/03/2023
dmi.bios.release: 1.17
dmi.bios.vendor: LENOVO
dmi.bios.version: R20ET37W (1.17)
dmi.board.asset.tag: Not Available
dmi.board.name: 21EDCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: ThinkPad
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.17
dmi.modalias:
dmi:bvnLENOVO:bvrR20ET37W(1.17):bd08/03/2023:br1.17:efr1.17:svnLENOVO:pn21EDCTO1WW:pvrThinkPadE15Gen4:rvnLENOVO:rn21EDCTO1WW:rvrThinkPad:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21ED_BU_Think_FM_ThinkPadE15Gen4:
dmi.product.family: ThinkPad E15 Gen 4
dmi.product.name: 21EDCTO1WW
dmi.product.sku: LENOVO_MT_21ED_BU_Think_FM_ThinkPad E15 Gen 4
dmi.product.version: ThinkPad E15 Gen 4
dmi.sys.vendor: LENOVO
** Affects: linux-hwe-6.11 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2111565
Title:
Bluetooth not detected on MediaTek MT7921 (ThinkPad E15 Gen 4) in
Ubuntu 24.04
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