Bug#1028116: linux-image-6.0.0-4-amd64: Bluetooth no longer working with Mediatek MT7921K chipset

[Salvatore Bonaccorso <carnil@debian.org>]

Control: tags -1 + moreinfo

Hi Matthew,

On Fri, Jan 06, 2023 at 09:24:11PM -0800, Matthew McAllister wrote:
> Package: src:linux
> Version: 6.0.8-1
> Severity: normal
> Tags: upstream
> X-Debbugs-Cc: matthew.mcallister.0@gmail.com
> 
> Dear Maintainer,
> 
> Bluetooth is no longer usable with this chipset on this kernel version.
> /sys/class/bluetooth is not present after booting or rebooting. There are no
> lines relating to bluetooth in dmesg. Here is the relevant part of lsmod:
> mt7921e                32768  0
> mt7921_common          94208  1 mt7921e
> mt76_connac_lib        73728  2 mt7921e,mt7921_common
> mt76                  106496  3 mt7921e,mt7921_common,mt76_connac_lib
> mac80211             1159168  3 mt76,mt7921_common,mt76_connac_lib
> cfg80211             1118208  4 mt76,mac80211,mt7921_common,mt76_connac_lib
> 
> WiFi *does* continue to work with this chipset. Only bluetooth seems to be
> affected.

As 6.0.8-1 is not the most recent kernel in testing, can you test with
6.0.12-1 as well, or ideally even better with 6.1.2-1~exp1? Does the
problem persist there? 

If yes, would you be able to bisect against an older known working
kernel version to identify where the problem arise and got introduced?

Regards,
Salvatore