Only difference in the btmon output is the handle (256 instead of 67) - otherwise it all looks the same and it connects first time. What logs are useful? I have the Chromebook in developer mode and so I can capture whatever you want (hopefully!) On Wed, 22 Apr 2020 at 23:32, Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx> wrote: > > Hi James, > > On Wed, Apr 22, 2020 at 11:27 AM James Belchamber <james@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx> 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
