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Groups > linux.debian.kernel > #92579

Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86

From Tophetei <dontspam884@gmail.com>
Newsgroups linux.debian.bugs.dist, linux.debian.kernel
Subject Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86
Date 2026-05-17 17:30 +0200
Message-ID <MVLBf-5Qzt-1@gated-at.bofh.it> (permalink)
Organization linux.* mail to news gateway

Cross-posted to 2 groups.

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Source: linux
Version: 6.12.88-1
Severity: important
Tags: upstream
X-Debbugs-Cc: dontspam884@gmail.com

Dear Maintainer,

MediaTek MT7922 Bluetooth (USB 0489:e0d8) stopped working since kernel
6.12.86+deb13. The last working kernel is 6.12.63+deb13.

Hardware:
  Bus 003 Device 002: ID 0489:e0d8 Foxconn / Hon Hai Bluetooth 5.2 Adapter
  [MediaTek MT7922]

Kernel error (dmesg):
  Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time: 20241106163512
  Bluetooth: hci0: Failed to send wmt func ctrl (-22)
  Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is
  advertised, but not supported.

bluetoothctl: "No default controller available"
btmgmt info: "Index list with 0 items"

Bisect:
  Working:  linux-image-6.12.63+deb13-amd64 (6.12.63-1)
  Broken:   linux-image-6.12.86+deb13-amd64 (6.12.86-1)
  Broken:   linux-image-6.12.88+deb13-amd64 (6.12.88-1)
  Broken:   linux-image-7.1-amd64 (7.1~rc3-1~exp1)

Tested firmware: firmware-mediatek 20250410-2 and upstream
BT_RAM_CODE_MT7922_1_1_hdr.bin (Build Time: 20260224103448) — same result.

System: Debian 13 (trixie), amd64

-- System Information:
Debian Release: 13.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.12.63+deb13-amd64 (SMP w/12 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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Thread

Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86 Tophetei <dontspam884@gmail.com> - 2026-05-17 17:30 +0200
  Processed: Re: Bug#1136957: bluetooth: MediaTek MT7922 regression  - Failed to send wmt func ctrl (-22) since 6.12.86 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-17 20:40 +0200
  Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86 Salvatore Bonaccorso <carnil@debian.org> - 2026-05-17 20:40 +0200
  Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86 Ethan Rushforth <t2712142@gmail.com> - 2026-05-18 07:00 +0200

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