* [Bug 221551] New: btmtk: MT7921 (USB ID 0e8d:e020) Bluetooth broken since 7.0.7 — fix commit for 0489:e0e2 does not cover this PID
@ 2026-05-19 17:21 bugzilla-daemon
2026-05-19 17:21 ` [Bug 221551] " bugzilla-daemon
2026-05-19 17:23 ` bugzilla-daemon
0 siblings, 2 replies; 3+ messages in thread
From: bugzilla-daemon @ 2026-05-19 17:21 UTC (permalink / raw)
To: linux-bluetooth
https://bugzilla.kernel.org/show_bug.cgi?id=221551
Bug ID: 221551
Summary: btmtk: MT7921 (USB ID 0e8d:e020) Bluetooth broken
since 7.0.7 — fix commit 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 310158
--> https://bugzilla.kernel.org/attachment.cgi?id=310158&action=edit
dmesg (from kernel 7.0.9, relevant lines)
Regression: Bluetooth controller stops initialising on a MediaTek MT7921
since kernel 7.0.7. Last known good: 7.0.6.
Same symptom as the regression already discussed and patched for USB ID
0489:e0e2, but the fix does NOT resolve it for my device (0e8d:e020),
which suggests the patch missed a code path / device ID.
Hardware
--------
lspci: 03:00.0 Network controller [0280]: MEDIATEK Corp. Device [14c3:7920]
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 : broken (mainline Arch build, please confirm if you also
tested it)
7.0.9-hardened1-1 : broken (linux-hardened, includes the backport
https://github.com/anthraxx/linux-hardened/commit/<…81d80fcd09>
which targets 0489:e0e2 — it does NOT fix 0e8d:e020)
dmesg (relevant lines)
----------------------
[ 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.
Userspace state
---------------
bluetoothctl list → (no output)
bluetoothctl show → No default controller available
rfkill → hci0 not present / soft blocked depending on boot
Versions
--------
bluez : <colle ta version>
linux-firmware : <…>
linux-firmware-mediatek : <…>
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 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
- Related thread (same symptom, different PID 0489:e0d8):
https://bbs.archlinux.org/viewtopic.php?id=313561
- Fix that addresses 0489:e0e2 only:
https://github.com/anthraxx/linux-hardened/commit/<…81d80fcd09>
Please note: the existing fix above is referenced because it explicitly
does NOT cover USB ID 0e8d:e020. A second code path / device-ID entry
seems to be needed.
I can test patches.
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2026-05-19 17:21 [Bug 221551] New: btmtk: MT7921 (USB ID 0e8d:e020) Bluetooth broken since 7.0.7 — fix commit for 0489:e0e2 does not cover this PID bugzilla-daemon
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