On 2020-05-06 19:56, Andrey Semashev wrote:
Hello!
I have a problem connecting Sennheiser Momentum True Wireless 2
headphones over Bluetooth. The headphones say "Connected" and then
reboot immediately after. After reboot the headphones say "Power on" and
try connecting again, and fail the same way, and so on.
From the Bluetooth packet dump it looks like the problem happens after
bluetoothd sends AVRCP ListPlayerApplicationSettingAttributes message to
the headphones. The headphones send Not Implemented response and then
reboot. Both in the request and the response Wireshark shows warnings
about encoding issues.
I'm attaching a packet dump captured from one of the connection
attempts. The ListPlayerApplicationSettingAttributes message is in
packet 262 and the response is in packet 264.
This is on Kubuntu 20.04. I tried bluez 5.53 from Kubuntu and revision
3146b7a0785758be2d4e894d44e99d29c0db983e from git master - the behavior
is the same.
I've also verified that the headphones do work on Windows 10. On that
system, ListPlayerApplicationSettingAttributes is not present in the
packet exchange. I can provide the packet dump from Windows, if needed.
I hope this is the right place to report problems like this one. If not
- sorry, and please point me to the right place.
Thank you.
I'll add that I can connect the headphones if I disable AVRCP by adding
--noplugin=avrcp to bluetoothd command line.
