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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Wed, 22 Apr 2020 15:32:29 -0700
Message-ID: <CABBYNZJ2tn6Riz7uouxD0qa1M-dT7GbtUSkD-dbn1nj1B372iQ@mail.gmail.com>
Subject: Re: Setup Synchronous Connection fails when switching Sony WH-H900N
 headset to HSP
To:     James Belchamber <james@belchamber.com>
Cc:     Marcel Holtmann <marcel@holtmann.org>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
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Hi James,

On Wed, Apr 22, 2020 at 11:27 AM James Belchamber <james@belchamber.com> wrote:
>
> Just bumping this for visibility, still an issue with the latest kernel.
>
> Happy to test anything thrown my way.
>
> On Mon, 6 Apr 2020 at 16:19, James Belchamber <james@belchamber.com> wrote:
> >
> > When using my Sony WH-H900N headphones and switching from A2DP to
> > HSP/HFP the following error appears in journalctl:
> >
> > (  60.063|   0.000) D: [pulseaudio] module-bluez5-device.c: Acquiring
> > transport /org/bluez/hci0/dev_04_5D_4B_E9_C9_90/fd34
> > (  60.063|   0.000) I: [pulseaudio] backend-native.c: doing connect
> > (  60.174|   0.111) E: [pulseaudio] backend-native.c: connect():
> > Function not implemented
> >
> > And using btmon I can see the HCI command comes back with a failure
> > (full log attached):
> >
> > < HCI Command: Setup Synchronous Connection (0x01|0x0028) plen 17
> >         Handle: 67
> >         Transmit bandwidth: 8000
> >         Receive bandwidth: 8000
> >         Max latency: 10
> >         Setting: 0x0060
> >           Input Coding: Linear
> >           Input Data Format: 2's complement
> >           Input Sample Size: 16-bit
> >           # of bits padding at MSB: 0
> >           Air Coding Format: CVSD
> >         Retransmission effort: Optimize for power consumption (0x01)
> >         Packet type: 0x0380
> >           3-EV3 may not be used
> >           2-EV5 may not be used
> >           3-EV5 may not be used
> > > HCI Event: Command Status (0x0f) plen 4
> >       Setup Synchronous Connection (0x01|0x0028) ncmd 1
> >         Status: Success (0x00)
> > > HCI Event: Max Slots Change (0x1b) plen 3
> >         Handle: 67
> >         Max slots: 1
> > > HCI Event: Synchronous Connect Complete (0x2c) plen 17
> >         Status: Unspecified Error (0x1f)
> >         Handle: 67
> >         Address: 04:5D:4B:E9:C9:90 (Sony Corporation)
> >         Link type: eSCO (0x02)
> >         Transmission interval: 0x00
> >         Retransmission window: 0x00
> >         RX packet length: 0
> >         TX packet length: 0
> >         Air mode: u-law log (0x00)
> >
> > This works on ChromeOS, which also uses a (modified) BlueZ stack -
> > though I can't work out why :)

It doesn't look like it is a host problem and Ive never seem this
error before, have you tried with the same controller on Chrome OS? It
may be worth trying to capture the logs in Chrome OS so we can compare
if there is something different in the command parameters, but it
could as well be that Chrome uses HFP instead of HSP as PulseAudio
does and the headset is sensitive to that.

-- 
Luiz Augusto von Dentz