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Subject: Re: Bluetooth connection disconnects every few minutes
To:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>
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From:   Julian Sikorski <belegdol@gmail.com>
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Date:   Wed, 2 Sep 2020 07:58:29 +0200
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W dniu 02.09.2020 o 01:14, Luiz Augusto von Dentz pisze:
> Hi Julian,
> 
> On Tue, Sep 1, 2020 at 1:42 PM Julian Sikorski <belegdol@gmail.com> wrote:
>>
>> W dniu 01.09.2020 o 22:10, Julian Sikorski pisze:
>>> W dniu 12.08.2018 o 17:49, Julian Sikorski pisze:
>>>> W dniu 01.08.2018 o 19:46, Julian Sikorski pisze:
>>>>> W dniu 09.07.2018 o 18:51, Julian Sikorski pisze:
>>>>>> W dniu 08.07.2018 o 19:46, Georg Chini pisze:
>>>>>>> On 08.07.2018 15:21, Julian Sikorski wrote:
>>>>>>>> W dniu 02.07.2018 o 20:09, Julian Sikorski pisze:
>>>>>>>>> W dniu 02.07.2018 o 18:04, Georg Chini pisze:
>>>>>>>>>> On 02.07.2018 17:58, Julian Sikorski wrote:
>>>>>>>>>>> W dniu 29.06.2018 o 21:47, Julian Sikorski pisze:
>>>>>>>>>>>> Hi list,
>>>>>>>>>>>>
>>>>>>>>>>>> I have noticed that the bluetooth connection between my laptop (Intel
>>>>>>>>>>>> 7260) and my headphones (Sennheiser Momentum Wirelless) is very
>>>>>>>>>>>> unreliable. While under Windows 10 devices stay connected for
>>>>>>>>>>>> hours on
>>>>>>>>>>>> end, under Fedora 28 the connection is lost every few minutes at
>>>>>>>>>>>> most.
>>>>>>>>>>>> Often the connection will be reestablished only to be lost again.
>>>>>>>>>>>> bluetoothd shows messages like:
>>>>>>>>>>>>
>>>>>>>
>>>>>>>>>>>> I am not sure where to look further. Does it look like an issue with
>>>>>>>>>>>> pulseaudio, or a deeper problem with linux bluetooth stack? Thanks
>>>>>>>>>>>> for
>>>>>>>>>>>> your input in advance!
>>>>>>>>>>>>
>>>>>>>>>>>> Best regards,
>>>>>>>>>>>> Julian
>>>>>>>>>>> This is what is logged by pulseaudio at the time the connection is
>>>>>>>>>>> lost:
>>>>>>>>>>>
>>>>>>>>>>> ( 118.064|  34.694) I: [bluetooth] module-bluez5-device.c: FD error:
>>>>>>>>>>> POLLERR POLLHUP
>>>>>>>>>>> ( 118.064|   0.000) I: [bluetooth] bluez5-util.c: Transport
>>>>>>>>>>> /org/bluez/hci0/dev_00_1B_66_81_8D_76/fd27 auto-released by BlueZ or
>>>>>>>>>>> already released
>>>>>>>>>>> ( 118.064|   0.000) I: [pulseaudio] backend-native.c: Lost RFCOMM
>>>>>>>>>>> connection.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>  From what you are writing, it looks to me as if the issue is in the
>>>>>>>>>> USB
>>>>>>>>>> stack and the BT dongle keeps disconnecting/connecting. Have you
>>>>>>>>>> tried another dongle?
>>>>>>>>> Hi,
>>>>>>>>>
>>>>>>>>> I unfortunately do not own any other dongles. I tried getting some
>>>>>>>>> useful info with btmon but the log seems flooded with way too many
>>>>>>>>> messages to make anything out.
>>>>>>>>>
>>>>>>>> Hi Georg,
>>>>>>>>
>>>>>>>> it looks like the problem is more related to how the dongle interacts
>>>>>>>> with this specific headphone model. I have recently bought another one
>>>>>>>> for running (AfterShokz Trekz Air) and it works perfectly, connecting
>>>>>>>> automatically, staying connected and even switching profiles
>>>>>>>> automatically without issues so far.
>>>>>>>> The hci0: last event is not cmd complete (0x0f) message seems harmless
>>>>>>>> as it spams the dmesg output regardless of the device connected (and
>>>>>>>> also when no device is connected at all.
>>>>>>>> It appears that whatever is happening it makes the dongle reconnect:
>>>>>>>>
>>>>>>>> [nie lip  8 15:14:12 2018] usb 2-1.4: USB disconnect, device number 6
>>>>>>>> [nie lip  8 15:14:12 2018] usb 2-1.4: new full-speed USB device number 7
>>>>>>>> using ehci-pci
>>>>>>>> [nie lip  8 15:14:12 2018] usb 2-1.4: New USB device found,
>>>>>>>> idVendor=8087, idProduct=07dc, bcdDevice= 0.01
>>>>>>>> [nie lip  8 15:14:12 2018] usb 2-1.4: New USB device strings: Mfr=0,
>>>>>>>> Product=0, SerialNumber=0
>>>>>>>> [nie lip  8 15:14:12 2018] Bluetooth: hci0: read Intel version:
>>>>>>>> 3707100180012d0d2a
>>>>>>>> [nie lip  8 15:14:12 2018] Bluetooth: hci0: Intel device is already
>>>>>>>> patched. patch num: 2a
>>>>>>>>
>>>>>>>> Where would you recommend to look for reasons for this behaviour? btmon?
>>>>>>>> Thank you for the pointers!
>>>>>>>>
>>>>>>>> Best regards,
>>>>>>>> Julian
>>>>>>>>
>>>>>>>>
>>>>>>> Hi Julian,
>>>>>>>
>>>>>>> sorry, I have no further ideas. Maybe Luiz can help you to investigate.
>>>>>>> To me it looks like the headphone is sending something that makes the
>>>>>>> dongle reset.
>>>>>>>
>>>>>>> Regards
>>>>>>>             Georg
>>>>>>
>>>>>> Hi Georg,
>>>>>>
>>>>>> no worries - hopefully Luiz will find some time to look into this.
>>>>>> In the meantime I have been getting acquainted with btmon. I have
>>>>>> managed to pinpoint the exact moment during which sound stops coming
>>>>>> through the headphones and starts coming through the laptop speakers. In
>>>>>> the below testcase, it happens at 18:42:58:
>>>>>>
>>>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>>>                               #1825 [hci0] 18:42:58.908586
>>>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>>>                               #1826 [hci0] 18:42:58.928877
>>>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>>>> @ MGMT Event: Class Of Device Changed (0x0007) plen 3
>>>>>>                            {0x0002} [hci0] 18:43:00.653578
>>>>>>         Class: 0x000000
>>>>>>           Major class: Miscellaneous
>>>>>>           Minor class: 0x00
>>>>>> @ MGMT Event: Class Of Device Changed (0x0007) plen 3
>>>>>>                            {0x0001} [hci0] 18:43:00.653578
>>>>>>         Class: 0x000000
>>>>>>           Major class: Miscellaneous
>>>>>>           Minor class: 0x00
>>>>>> @ MGMT Event: New Settings (0x0006) plen 4
>>>>>>                            {0x0002} [hci0] 18:43:00.653609
>>>>>>         Current settings: 0x00000ada
>>>>>>           Connectable
>>>>>>           Discoverable
>>>>>>           Bondable
>>>>>>           Secure Simple Pairing
>>>>>>           BR/EDR
>>>>>>           Low Energy
>>>>>>           Secure Connections
>>>>>> @ MGMT Event: New Settings (0x0006) plen 4
>>>>>>                            {0x0001} [hci0] 18:43:00.653609
>>>>>>         Current settings: 0x00000ada
>>>>>>           Connectable
>>>>>>           Discoverable
>>>>>>           Bondable
>>>>>>           Secure Simple Pairing
>>>>>>           BR/EDR
>>>>>>           Low Energy
>>>>>>           Secure Connections
>>>>>> = bluetoothd: Unable to get io data for Headset Voice gateway:
>>>>>> getpeername: Transport endpoint is not connected..   18:43:00.654133
>>>>>> = Close Index: 7C:5C:F8:B2:DF:08
>>>>>>                                     [hci0] 18:43:00.678348
>>>>>> @ MGMT Event: Index Removed (0x0005) plen 0
>>>>>>                            {0x0002} [hci0] 18:43:00.678372
>>>>>> @ MGMT Event: Index Removed (0x0005) plen 0
>>>>>>                            {0x0001} [hci0] 18:43:00.678372
>>>>>> = Delete Index: 7C:5C:F8:B2:DF:08
>>>>>>                                     [hci0] 18:43:00.678377
>>>>>> = bluetoothd: Endpoint unregistered: sender=:1.1492
>>>>>> path=/MediaEndpoint/A2DPSource
>>>>>> 18:43:00.678966
>>>>>> = bluetoothd: Endpoint unregistered: sender=:1.1492
>>>>>> path=/MediaEndpoint/A2DPSink
>>>>>> 18:43:00.678984
>>>>>>
>>>>>> I am copying linux-bluetooth, maybe someone there will have an idea as
>>>>>> well. Thank you for all your help in advance!
>>>>>>
>>>>>> Best regards,
>>>>>> Julian
>>>>>
>>>>> Hi all,
>>>>>
>>>>> I tried to get more information using hcidump, but it does not appear
>>>>> very interesting. I am attaching it here just in case. The last entry
>>>>> appearing - command complete (read encryption key size) - appears upon
>>>>> successful connection, not when the connection is dropped. How else
>>>>> could I try to figure out what is being sent at the time of
>>>>> disconnection? Thank you!
>>>>>
>>>>> Best regards,
>>>>> Julian
>>>>
>>>> Hi list,
>>>>
>>>> I just realised I never attached the full btmon dump. Here it goes, the
>>>> connection drops at 17:32:04:
>>>>
>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>                               #1340 [hci0] 17:32:04.774611
>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>>> HCI Event: Number of Completed Packets (0x13) plen 5
>>>>                               #1341 [hci0] 17:32:04.783175
>>>>         Num handles: 1
>>>>         Handle: 256
>>>>         Count: 1
>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>                               #1342 [hci0] 17:32:04.794981
>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>>> HCI Event: Number of Completed Packets (0x13) plen 5
>>>>                               #1343 [hci0] 17:32:04.803054
>>>>         Num handles: 1
>>>>         Handle: 256
>>>>         Count: 1
>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>                               #1344 [hci0] 17:32:04.815326
>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>>> HCI Event: Number of Completed Packets (0x13) plen 5
>>>>                               #1345 [hci0] 17:32:04.823198
>>>>         Num handles: 1
>>>>         Handle: 256
>>>>         Count: 1
>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>                               #1346 [hci0] 17:32:04.835578
>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>                               #1347 [hci0] 17:32:04.856093
>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>                               #1348 [hci0] 17:32:04.876186
>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>                               #1349 [hci0] 17:32:04.896454
>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>> < ACL Data TX: Handle 256 flags 0x02 dlen 850
>>>>                               #1350 [hci0] 17:32:04.916869
>>>>       Channel: 450 len 846 [PSM 25 mode 0] {chan 2}
>>>> @ MGMT Event: Class Of Device Changed (0x0007) plen 3
>>>>                            {0x0002} [hci0] 17:32:06.637019
>>>>         Class: 0x000000
>>>>           Major class: Miscellaneous
>>>>           Minor class: 0x00
>>>> @ MGMT Event: Class Of Device Changed (0x0007) plen 3
>>>>                            {0x0001} [hci0] 17:32:06.637019
>>>>         Class: 0x000000
>>>>           Major class: Miscellaneous
>>>>           Minor class: 0x00
>>>> @ MGMT Event: New Settings (0x0006) plen 4
>>>>                            {0x0002} [hci0] 17:32:06.637034
>>>>         Current settings: 0x00000ada
>>>>           Connectable
>>>>           Discoverable
>>>>           Bondable
>>>>           Secure Simple Pairing
>>>>           BR/EDR
>>>>           Low Energy
>>>>           Secure Connections
>>>> @ MGMT Event: New Settings (0x0006) plen 4
>>>>                            {0x0001} [hci0] 17:32:06.637034
>>>>         Current settings: 0x00000ada
>>>>           Connectable
>>>>           Discoverable
>>>>           Bondable
>>>>           Secure Simple Pairing
>>>>           BR/EDR
>>>>           Low Energy
>>>>           Secure Connections
>>>> = Close Index: 7C:5C:F8:B2:DF:08
>>>>                                     [hci0] 17:32:06.654087
>>>> @ MGMT Event: Index Removed (0x0005) plen 0
>>>>                            {0x0002} [hci0] 17:32:06.654114
>>>> @ MGMT Event: Index Removed (0x0005) plen 0
>>>>                            {0x0001} [hci0] 17:32:06.654114
>>>> = Delete Index: 7C:5C:F8:B2:DF:08
>>>>                                     [hci0] 17:32:06.654120
>>>> = bluetoothd: Unable to get io data for Headset Voice gateway:
>>>> getpeername: Transport endpoint is not connected..   17:32:06.654352
>>>> = bluetoothd: Endpoint unregistered: sender=:1.750
>>>> path=/MediaEndpoint/A2DPSource
>>>> 17:32:06.654796
>>>> = bluetoothd: Endpoint unregistered: sender=:1.750
>>>> path=/MediaEndpoint/A2DPSink
>>>> 17:32:06.654836
>>>>
>>>> I tried sending the btmon capture as attachment but it appears to be too
>>>> large for the list, so I uploaded it here instead:
>>>>
>>>> https://belegdol.fedorapeople.org/btmon-aug.log
> 
> Is this perhaps related to https://github.com/bluez/bluez/issues/18,
> we have a fix already applied upstream for it.
> 

Hi Luiz,

it looks like a different issue. I tried both passing --noplugin=avrcp
and applying the two patches mentioned in the github issue to Fedora
RPM, neither helped. I am attaching a new btmon capture in case
something changed. In this one the disconnect happens after #371.

Best regards,
Julian
>>>> Best regards,
>>>> Julian
>>>>
>>>
>>> Hi all,
>>>
>>> I have tried the headset again with kernel-5.8.4, bluez-5.54 and
>>> pulseaudio-13.99.1. The situation has unfortunately not improved in the
>>> last two years.
>>> I am attaching the btmon capture of two connection attempts:
>>> - the first connects and then almost immediately disconnects
>>> - the second never succeeds
>>> Does the capture provide any information as to why the connection is
>>> failing? If I can provide any more data, please let me know. Thanks!
>>>
>>> Best regards,
>>> Julian
>>>
>> If I am not mistaken, the disconnect happens right after #636
>>
>> Best regards,
>> Julian
> 
> 
> 


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