Bug#1136807: linux-image-6.12.88+deb13-amd64: mediatek bluetooth regression maybe identified

From	Forest <forestix@gaga.casa>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1136807: linux-image-6.12.88+deb13-amd64: mediatek bluetooth regression maybe identified
Date	2026-05-16 23:40 +0200
Message-ID	<MVuTL-5EI8-1@gated-at.bofh.it> (permalink)
References	<MVjEZ-5x6p-5@gated-at.bofh.it> <MVrVT-5CNP-1@gated-at.bofh.it> <MVjEZ-5x6p-5@gated-at.bofh.it> <MVrVT-5CNP-1@gated-at.bofh.it>
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The offending mainline commit was indeed backported into 6.12.88,
as commit c411cf1bfde9.

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.12.y&id=c411cf1bfde951cfa821809cf4020ba177f76e0c

A patch titled "Bluetooth: btmtk: accept too short WMT FUNC_CTRL events"
was submitted and discussed about three weeks ago:

https://lore.kernel.org/linux-bluetooth/770d36b07311bf88210c187923f243fb9f126f04.1777058551.git.pav@iki.fi/

That patch was committed to bluetooth-next.git by Luiz Augusto von Dentz
(linux bluetooth drivers maintainer) early this week:

https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/?id=162b1adeb057

I applied that patch to debian's linux-image-6.12.88 using the
debian/bin/test-patches script, and bluetooth appears to be restored in
the resulting build.

Any chance we could get this applied in the official trixie kernel?

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Bug#1136807: linux-image-6.12.88+deb13-amd64: mediatek bluetooth regression maybe identified Forest <forestix@gaga.casa> - 2026-05-16 23:40 +0200

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