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[188.255.20.215]) by smtp.gmail.com with ESMTPSA id u3sm2014933lfq.59.2020.05.06.10.28.56 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 May 2020 10:28:56 -0700 (PDT) Subject: Re: avrcp: Cannot connect Sennheiser Momentum True Wireless 2 From: Andrey Semashev To: linux-bluetooth@vger.kernel.org References: <7c4e6f59-d2ef-36c0-46df-0195fad40e7e@gmail.com> Message-ID: <76911d0f-dd24-5536-586a-a8e9bc7ad786@gmail.com> Date: Wed, 6 May 2020 20:28:55 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <7c4e6f59-d2ef-36c0-46df-0195fad40e7e@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org 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.