Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)"

From	Andreas Sundstrom <sunkan+debian.bugs@zappa.cx>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)"
Date	2026-05-16 12:00 +0200
Message-ID	<MVjYl-5xdH-3@gated-at.bofh.it> (permalink)
References	<MV92V-5pLN-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

Show all headers | View raw

Package: src:linux
Followup-For: Bug #1136790

Dear Maintainer,

I am also affected by this bug, but running a slightly different device.

$ LANG=C journalctl -b -1 --grep 'hci0' --no-hostname --utc
May 16 08:00:36 kernel: Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time: 20241106163512
May 16 08:00:36 kernel: Bluetooth: hci0: Failed to send wmt func ctrl (-22)
May 16 08:00:36 kernel: Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported.

# grep -s . /sys/class/bluetooth/hci?/device/../id*
/sys/class/bluetooth/hci0/device/../idProduct:3568
/sys/class/bluetooth/hci0/device/../idVendor:13d3

$ grep 13d3 /usr/share/misc/usb.ids
13d3  IMC Networks

Support for this bluetooth radio was added in commit c69ecb0ea4c96 (so don't get confused by the manufacturer being "IMC Networks")

Reverting back to 6.12.85+deb13-amd64 makes the device work again.


Let me know if there is anything else you need to know.

--
Andreas

Back to linux.debian.kernel | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)" Anton Shestakov <av6@dwimlabs.net> - 2026-05-16 00:20 +0200
  Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)" Antonio Russo <aerusso@aerusso.net> - 2026-05-16 04:10 +0200
  Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)" Steinar Bang <sb@dod.no> - 2026-05-16 10:40 +0200
  Bug#1136790: mt7921e: bluetooth is broken with "Bluetooth: hci0: Failed to send wmt func ctrl (-22)" Andreas Sundstrom <sunkan+debian.bugs@zappa.cx> - 2026-05-16 12:00 +0200
  Bug#1136790: Bluetooth stopped working with kernel 6.12.88 Stephan Verbücheln <verbuecheln@posteo.de> - 2026-05-18 21:00 +0200

csiph-web