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From:   James Belchamber <james@belchamber.com>
Date:   Wed, 22 Apr 2020 18:22:08 +0000
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Subject: Re: Setup Synchronous Connection fails when switching Sony WH-H900N
 headset to HSP
To:     marcel@holtmann.org, johan.hedberg@gmail.com
Cc:     linux-bluetooth@vger.kernel.org
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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 :)