[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1865257
Title:
Pulseaudio needs kernal conf IMU=size (64)
Status in linux package in Ubuntu:
Expired
Bug description:
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.
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