[pulseaudio-discuss] Bose QC35 HFP/HSP MTU size

Sebastian Reichel sre at kernel.org
Thu Sep 14 11:44:02 UTC 2017


Bose QC35 are affected by the attached upgrade notice
from Pulseaudio 11. The workaround fixes the problem.

-- Sebastian

> 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.
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