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Bug#1136898: linux-source-6.12: Bluetooth broken on 6.12.88: Foxconn/MediaTek 0489:e0f5 fails with "wmt func ctrl (-22)"

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Package: linux-source-6.12
Version: 6.12.88-1
Severity: important
X-Debbugs-Cc: sgardette@dalealbo.fr

Dear Maintainer,


   After running "sudo apt upgrade" on 2026-05-16, the kernel was updated from
6.12.73+deb13-amd64 to 6.12.88+deb13-amd64. After reboot, Bluetooth stopped
working completely. The toggle in GNOME settings is grayed out.

The Bluetooth adapter is a Foxconn/Hon Hai device (USB ID 0489:e0f5) on an
ASUS Zenbook 14 UM3406KA.

Symptoms on 6.12.88:
- hciconfig shows hci0 as DOWN with BD Address 00:00:00:00:00:00
- bluetoothctl show: "No default controller available"
- dmesg: "Bluetooth: hci0: Failed to send wmt func ctrl (-22)"

The previous kernel 6.12.73+deb13-amd64 works perfectly with this device.
Workaround: booting with kernel 6.12.73+deb13-amd64 restores Bluetooth function.
  



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

Kernel: Linux 6.12.73+deb13-amd64 (SMP w/16 CPU threads; PREEMPT)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.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

Versions of packages linux-source-6.12 depends on:
ii  binutils  2.44-3
ii  xz-utils  5.8.1-1

Versions of packages linux-source-6.12 recommends:
ii  bc                 1.07.1-4
pn  bison              <none>
ii  build-essential    12.12
ii  cpio               2.15+dfsg-2
pn  flex               <none>
ii  kmod               34.2-2
pn  libelf-dev         <none>
pn  libssl-dev         <none>
pn  linux-config-6.12  <none>
pn  rsync              <none>

Versions of packages linux-source-6.12 suggests:
pn  libncurses-dev | ncurses-dev  <none>
ii  pkgconf                       1.8.1-4
pn  qtbase5-dev                   <none>

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Bug#1136898: linux-source-6.12: Bluetooth broken on 6.12.88: Foxconn/MediaTek 0489:e0f5 fails with "wmt func ctrl (-22)" Sebastien Gardette <sgardette@dalealbo.fr> - 2026-05-17 08:50 +0200

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