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

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From	Ethan Rushforth <t2712142@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	Mon, 18 May 2026 07:00:01 +0200
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Source: linux
Version: 6.12.88-1
Followup-For: Bug #1136957
X-Debbugs-Cc: t2712142@gmail.com

Dear Maintainer,

I can confirm this bug on MediaTek MT7922 (03:00.0 Network controller:
MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter).

Broken kernel:  6.12.88+deb13-amd64 (btmtk srcversion: 77A9F0819734D2E124CC5EE)
Working kernel: 6.12.86+deb13-amd64 (btmtk srcversion: 3FBB445873F92B59A0135EB)

The btusb module srcversion is identical between both kernels, confirming
btmtk is the only changed module.

dmesg on 6.12.88 (broken):
  Bluetooth: hci0: Failed to send wmt func ctrl (-22)
  Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is
  advertised, but not supported.

dmesg on 6.12.86 (working):
  Bluetooth: hci0: Device setup in 2217588 usecs
  (no wmt func ctrl error)

The 6.12.88 changelog includes "Bluetooth: btmtk: Fix failed to send func
ctrl for MediaTek devices" which appears to have introduced this regression
rather than fixing it on this hardware.


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

Kernel: Linux 6.12.88+deb13-amd64 (SMP w/16 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
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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