* [Bug 221552] New: btmtk: MT7921 (USB 0e8d:e020 / PCI 14c3:7920) Bluetooth broken since 7.0.7 - fix for 0489:e0e2 does not cover this PID
@ 2026-05-19 17:29 bugzilla-daemon
2026-05-20 7:58 ` [Bug 221552] " bugzilla-daemon
0 siblings, 1 reply; 2+ messages in thread
From: bugzilla-daemon @ 2026-05-19 17:29 UTC (permalink / raw)
To: linux-bluetooth
https://bugzilla.kernel.org/show_bug.cgi?id=221552
Bug ID: 221552
Summary: btmtk: MT7921 (USB 0e8d:e020 / PCI 14c3:7920)
Bluetooth broken since 7.0.7 - fix for 0489:e0e2 does
not cover this PID
Product: Drivers
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: blocking
Priority: P3
Component: Bluetooth
Assignee: linux-bluetooth@vger.kernel.org
Reporter: gagnieux.virgil@proton.me
Regression: No
Created attachment 310159
--> https://bugzilla.kernel.org/attachment.cgi?id=310159&action=edit
dmesg kernel (from 7.0.9-hardened1-1-hardened)
Regression: Bluetooth controller fails to initialise on a MediaTek MT7921
(Legion Pro 5 16ADR10, Realtek-branded module) since kernel 7.0.7.
Last known good: 7.0.6. Same dmesg symptom as the regression already
patched for USB ID 0489:e0e2, but the fix does NOT resolve it for this
device (USB 0e8d:e020), which suggests the patch missed a code path or
device-ID entry.
Hardware
--------
lspci -nnk:
03:00.0 Network controller [0280]: MEDIATEK Corp. Device [14c3:7920]
DeviceName: Realtek
Subsystem: Lenovo Device [17aa:e020]
Kernel driver in use: mt7921e
lsusb:
Bus 003 Device 006: ID 0e8d:e020 MediaTek Inc. Wireless_Device
Kernels tested
--------------
7.0.6 : Bluetooth works
7.0.8 / 7.0.9 (mainline) : broken
7.0.9-hardened1-1 : broken (linux-hardened — current)
This build includes the backport
https://github.com/anthraxx/linux-hardened/commit/<…81d80fcd09>
which adds the fix for USB ID 0489:e0e2. It does NOT fix 0e8d:e020.
uname -r : 7.0.9-hardened1-1-hardened
dmesg (from kernel 7.0.9, relevant lines)
-----------------------------------------
[ 23.898011] Bluetooth: Core ver 2.22
[ 23.898032] NET: Registered PF_BLUETOOTH protocol family
[ 23.898033] Bluetooth: HCI device and connection manager initialized
[ 23.898041] Bluetooth: HCI socket layer initialized
[ 23.898043] Bluetooth: L2CAP socket layer initialized
[ 23.898045] Bluetooth: SCO socket layer initialized
[ 24.800153] Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time:
20260224111231
[ 24.922472] Bluetooth: hci0: Failed to send wmt func ctrl (-22)
[ 24.922477] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection
command is advertised, but not supported.
[ 25.517793] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 25.517796] Bluetooth: BNEP filters: protocol multicast
[ 25.517800] Bluetooth: BNEP socket layer initialized
Userspace state
---------------
bluetoothctl list → (no output)
bluetoothctl show → No default controller available
Module
------
modinfo btmtk:
filename:
/lib/modules/7.0.9-hardened1-1-hardened/kernel/drivers/bluetooth/btmtk.ko.zst
firmware: mediatek/mt7925/BT_RAM_CODE_MT7925_1_1_hdr.bin
firmware: mediatek/BT_RAM_CODE_MT7961_1_2_hdr.bin
firmware: mediatek/BT_RAM_CODE_MT7922_1_1_hdr.bin
firmware: mediatek/mt7668pr2h.bin
Versions (Arch Linux)
---------------------
linux-firmware : 20260410-1
linux-firmware-mediatek : 20260410-1
bluez : 5.86-6
Steps to reproduce
------------------
1. Boot kernel >= 7.0.7 on a system with MediaTek 14c3:7920 / USB 0e8d:e020.
2. Bluetooth controller fails to initialise; -EINVAL (-22) on wmt func ctrl.
Expected
--------
Controller comes up, same as on 7.0.6.
Related
-------
- Arch forum thread: https://bbs.archlinux.org/viewtopic.php?id=313552
- Same symptom, different PID 0489:e0d8:
https://bbs.archlinux.org/viewtopic.php?id=313561
- Existing fix that targets 0489:e0e2 only:
https://github.com/anthraxx/linux-hardened/commit/d019930b0049fc2648a6b279893d8ad330596e81
(does not cover USB ID 0e8d:e020 — a second device-ID / code-path entry
appears to be needed)
I can test patches.
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2026-05-19 17:29 [Bug 221552] New: btmtk: MT7921 (USB 0e8d:e020 / PCI 14c3:7920) Bluetooth broken since 7.0.7 - fix for 0489:e0e2 does not cover this PID bugzilla-daemon
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