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

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  Bug#1028116: linux-image-6.0.0-4-amd64: Bluetooth no longer working with Mediatek MT7921K chipset Salvatore Bonaccorso <carnil@debian.org> - 2023-01-07 10:50 +0100
    Bug#1028116: linux-image-6.0.0-4-amd64: Bluetooth no longer working with Mediatek MT7921K chipset Matthew McAllister <matthew.mcallister.0@gmail.com> - 2023-01-07 20:00 +0100
      Bug#1028116: linux-image-6.0.0-4-amd64: Bluetooth no longer working with Mediatek MT7921K chipset Salvatore Bonaccorso <carnil@debian.org> - 2023-01-07 21:50 +0100
        Bug#1028116: linux-image-6.0.0-4-amd64: Bluetooth no longer working with Mediatek MT7921K chipset Matthew McAllister <matthew.mcallister.0@gmail.com> - 2023-01-27 07:50 +0100

#77847 — Bug#1028116: linux-image-6.0.0-4-amd64: Bluetooth no longer working with Mediatek MT7921K chipset

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

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#77851

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

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#77855

Hi Matthew,

On Sat, Jan 07, 2023 at 10:52:58AM -0800, Matthew McAllister wrote:
> 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.

Thanks for your quick response. 

For installing 5.19.11-1 to confirm it works: When a package is not
anymore in the archive, you can use the snapshots service which
contains the old versions:

https://snapshot.debian.org/

You can get from there the old binary package which you can install:
https://snapshot.debian.org/package/linux/ (to get the unsigned
packages), or https://snapshot.debian.org/package/linux-signed-amd64/
for the signed one.

You can use the same as well for installing the newer versions (or
alternatively add, temporarily, the experimental and unstable
sources.list entries and install the packages).

For testing newer versions, 6.1.4-1 was uploaded earlier today to
unstable.

Knowing first if it's a regression from the linux packages would be
helpful, so confirming it indeed still works with 5.19.11-1.

Does this gives you some hints on how to start?

Regards,
Salvatore

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#78083

Hi again,

I found the time to tinker on my computer the past week. I installed 6.1.4-1 and 5.19.11-1 and neither kernel them worked; eventually I came to the conclusion my hardware is faulty. There's a thread in debian-user about it.

Thank you for your help; you should close this report as I no longer have reason to believe this is a software issue.

Matthew

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