Public bug reported:
This issue was first discovered when I got this headset 2 years back:
https://www.amazon.co.uk/gp/product/B01C2QCPYI.
STEPS
* Enable Bluetooth on the PC
* Have music or some video playing on the PC
* Power on the (already-paired) headset. It automatically connects to the PC.
** Attachment added: "Syslog taken when the PC initiates the connection"
https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1941977/+attachment/5521418/+files/syslog_PCInitiated
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** Attachment added: "Syslog taken when the headset initiates the connection"
https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1941977/+attachment/5521416/+files/syslog_HeadsetInitiated
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** Attachment added: "HCI snoop taken when the PC initiates the connection"
https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1941977/+attachment/5521417/+files/PCInitiated.snoop
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I've spent a while studying the snoop/syslogs and Bluez source, and I
believe I've narrowed down the issue.
* From the Headset-Initiated snoop, we can see where the headset
connected the ACL (23:54:47 UTC), followed shortly by connecting HFP
(successfully).
* Very soon after the headset connected
So why did Bluez initiate A2DP even when the headset was the one that
established the ACL?
The bluetoothd logs help out here:
Aug 29 00:54:47 RhoPC bluetoothd[4046739]: src/adapter.c:connected_callback()
hci0 device FC:58:FA:7F:E5:18 connected eir_len 5
Aug 29 00:54:47 RhoPC bluetoothd[4046739]:
That one's clear enough from the earlier log snippet and source:
Aug 29 00:54:47 RhoPC bluetoothd[4046739]: src/profile.c:ext_connect() Headset
Voice gateway connected to FC:58:FA:7F:E5:18
Aug 29 00:54:47 RhoPC bluetoothd[4046739]: src/service.c:change_state()
0x562f6441d710: device FC:58:FA:7F:
I attached snoop/logs where the PC initiated the connection, for
comparison. There, the issue doesn't happen, the headset calmly allows
the PC to establish all the profiles since the PC connected the ACL.
One can also see the difference in flow:
Aug 29 01:57:02 RhoPC bluetoothd[4053589]: src/devi
** Tags added: a2dp hfp sco
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https://bugs.launchpad.net/bugs/1941977
Title:
PC streams music over low-quality HFP/SCO connection, instead of
A2DP/AVDTP
Stat
*** This bug is a duplicate of bug 1838151 ***
https://bugs.launchpad.net/bugs/1838151
Hi Daniel, thanks for responding. This isn't a duplicate of that issue
-- that ticket complains of the current NB/8k default which is pretty
low-quality, now requesting that the stack support WBS/16k for hig
Nope, if anything, it's even worse. On Indri, the PC audio doesn't even
get streamed over SCO at all -- the media channel just gets disconnected
when Bluez times out in the middle of an AVDTP SET_CONFIGURATION. Here,
as before, both headset and Bluez are jockeying for first to
connect/setup A2DP an
** Attachment added: "HCI snoop taken when the headset initiates the connection
on Indri"
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1941977/+attachment/5522607/+files/HeadsetInitiated_Indri.snoop
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For comparison, I've attached these Android HCI snoop logs, taken when
the same headset initiates a connection to an Android handset this time.
>From ~22:00:50 UTC when the ACL was connected between them, one can see
that the handset remains chill, allowing the headset to connect any
profiles its
** Also affects: bluez (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1941977
Title:
PC streams music over low-qual
Thanks Igor, I didn't know Bluez issues are being tracked on Github,
would've probably raised this there first/instead. I've opened it here:
https://github.com/bluez/bluez/issues/205, offering a summary, people
can always come here if they need to get traces and such.
** Bug watch added: github.co
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