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From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date: Thu, 6 Jun 2024 17:23:11 -0400
Message-ID: <CABBYNZLE9uYiRM-baoBt=RQktq__TguMETgmVWGzfeorARfm4w@mail.gmail.com>
Subject: Re: Bluetooth Kernel Bug: After connecting either HFP/HSP or A2DP is
 not available (Regression in 6.9.3, 6.8.12)
To: =?UTF-8?Q?Timo_Schr=C3=B6der?= <der.timosch@gmail.com>
Cc: stable@vger.kernel.org, regressions@lists.linux.dev, 
	linux-bluetooth@vger.kernel.org, luiz.von.dentz@intel.com
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Hi Timo,

On Thu, Jun 6, 2024 at 4:46=E2=80=AFPM Timo Schr=C3=B6der <der.timosch@gmai=
l.com> wrote:
>
> Hallo,
> on my two notebooks, one with Ubuntu (Mainline Kernel 6.9.3, bluez
> 5.7.2) and the other one with Manjaro (6.9.3, bluez 5.7.6) I'm having
> problems with my Sony WH-1000XM3 and Shure BT1. Either A2DP or HFP/HSP
> is not available after the connection has been established after a
> reboot or a reconnection. It's reproducible that with the WH-1000XM3
> the A2DP profiles are missing and with the Shure BT1 HFP/HSP profiles
> are missing. It also takes longer than usual to connect and I have a
> log message in the journal:
>
> Jun 06 16:28:10 liebig bluetoothd[854]:
> profiles/audio/avdtp.c:cancel_request() Discover: Connection timed out
> (110)
>
> When I disable and re-enable bluetooth (while the Headsets are still
> on) and trigger a reconnect from the notebooks, A2DP and HFP/HSP
> Profiles are available again.
>
> I also tested it with 6.8.12 and it's the same problem. 6.8.11 and
> 6.9.2 don't have the problem.
> So I did a bisection. After reverting commit
> af1d425b6dc67cd67809f835dd7afb6be4d43e03 "Bluetooth: HCI: Remove
> HCI_AMP support" for 6.9.3 it's working again without problems.
>
> Let me know if you need anything from me.

Wait what, that patch has nothing to do with any of these profiles not
really sure how that would cause a regression really, are you sure you
don't have actual connection timeout happening at the link layer and
that by some chance didn't happen when running with HCI_AMP reverted?

I'd be surprised that HCI_AMP has any effect in most controllers
anyway, only virtual controllers was using that afaik.


--=20
Luiz Augusto von Dentz