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

[Matthew McAllister <matthew.mcallister.0@gmail.com>]

Sorry for my mistake. I upgraded to 6.0.12-1 and still no bluetooth. I 
additionally downgraded to 5.10.149-2, and that version had no bluetooth 
and no wifi support either. I wasn't able to even install 5.19.11-1; I 
suspect 5.19 may have been the last version I had installed where 
bluetooth actually worked.

I don't know how to install experimental kernel versions on testing, but 
I'm willing to try it out or compile it myself.

Matthew

On 1/7/23 1:40 AM, Salvatore Bonaccorso wrote:
> 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