Public bug reported:
Since Pulseaudio 11.0
https://www.freedesktop.org/wiki/Software/PulseAudio/Notes/11.0/
"Improved bluetooth MTU configuration
The packet size (a.k.a. MTU, "maximum transmission unit") that PulseAudio uses
with the bluetooth HSP profile was previously always configured to be 48 bytes.
That worked with most hardware, but some adapters require a different packet
size. Now PulseAudio asks the kernel what packet size should be used, which
fixes the problem.
However, a new problem appeared: some adapters that used to work with 48
byte packet size don't any more work with the size that the kernel tells
PulseAudio to use. If you find that HSP audio stopped working when
upgrading to PulseAudio 11.0, you can revert to the old behaviour by
passing option "autodetect_mtu=no" to module-bluetooth-discover in
/etc/pulse/default.pa. If that fixes the problem, then please report the
problem to the BlueZ and/or PulseAudio developers, so that the kernel
can be fixed.
Update: We decided to disable the MTU autodetection in 11.1 by default,
because the feature caused too much problems and it looked like the
kernel would not really get fixed even when people reported issues."
Presume its a config option in the kernel that differs on each model.
Pi3/4 should be 64 as they are very much like the 48 byte packages in
reverse as don't work with the default of 48.
Its listed as Pulse audio but presume it should be a config setting of
the kernel for each Pi model.
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
** Tags: kernel-bug
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https://bugs.launchpad.net/bugs/1865257
Title:
Pulseaudio needs kernal conf IMU=size (64)
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