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From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date: Fri, 7 Jun 2024 18:00:59 -0400
Message-ID: <CABBYNZJqULvfnafB5vA4PHPtzs_qmEQK8JZ3C09Q=wmvSZqwBA@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: regressions@leemhuis.info, 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 Fri, Jun 7, 2024 at 5:43=E2=80=AFPM Timo Schr=C3=B6der <der.timosch@gmai=
l.com> wrote:
>
> Am Fr., 7. Juni 2024 um 08:10 Uhr schrieb Linux regression tracking
> (Thorsten Leemhuis) <regressions@leemhuis.info>:
> >
> > On 06.06.24 23:23, Luiz Augusto von Dentz wrote:
> > > On Thu, Jun 6, 2024 at 4:46=E2=80=AFPM Timo Schr=C3=B6der <der.timosc=
h@gmail.com> wrote:
> > >> 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 havin=
g
> > >> problems with my Sony WH-1000XM3 and Shure BT1. Either A2DP or HFP/H=
SP
> > >> 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 profile=
s
> > >> 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 o=
ut
> > >> (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 no=
t
> > > really sure how that would cause a regression really, are you sure yo=
u
> > > 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.
> >
> > Stupid question from a bystander without knowledge in the field (so fee=
l
> > free to ignore this): is that patch maybe causing trouble because it ha=
s
> > some hidden dependency on a earlier change that was not backported to
> > 6.9.y?
> >
> > Timo, to rule that out (and it's good to know in general, too) it would
> > be good to known if current mainline (e.g. 6.10-rc) is affected as well=
.
> >
> > Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat=
)
> > --
> > Everything you wanna know about Linux kernel regression tracking:
> > https://linux-regtracking.leemhuis.info/about/#tldr
> > If I did something stupid, please tell me, as explained on that page.
>
> Hallo Thorsten, I tried with 6.10-rc2 and it's the same problem on my sys=
tems.

Could you please create a issue at
https://github.com/bluez/bluez/issues and then attach btmon traces and
bluetoothd? This is a really weird regression, also is your system
using pulseaudio or pipewire?

--=20
Luiz Augusto von Dentz