[Bug 2007331] Re: Fix HFP mSBC support on Realtek Bluetooth USB controller

[Ubuntu Kernel Bot]

This bug is awaiting verification that the linux-oem-6.1/6.1.0-1008.8
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-jammy' to 'verification-done-jammy'. If the
problem still exists, change the tag 'verification-needed-jammy' to
'verification-failed-jammy'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-oem-6.1 verification-needed-jammy

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https://bugs.launchpad.net/bugs/2007331

Title:
  Fix HFP mSBC support on Realtek Bluetooth USB controller

Status in HWE Next:
  New
Status in linux-oem-6.0 package in Ubuntu:
  Invalid
Status in linux-oem-6.1 package in Ubuntu:
  Invalid
Status in pulseaudio package in Ubuntu:
  Confirmed
Status in linux-oem-6.0 source package in Jammy:
  Confirmed
Status in linux-oem-6.1 source package in Jammy:
  Confirmed
Status in pulseaudio source package in Jammy:
  Confirmed
Status in linux-oem-6.0 source package in Kinetic:
  Invalid
Status in linux-oem-6.1 source package in Kinetic:
  Invalid
Status in pulseaudio source package in Kinetic:
  Confirmed
Status in linux-oem-6.0 source package in Lunar:
  Invalid
Status in linux-oem-6.1 source package in Lunar:
  Invalid
Status in pulseaudio source package in Lunar:
  Confirmed

Bug description:
  [Impact]
  When a BT headset is connected Realtek BT USB controller, HFP profile can't play or record sound when mSBC codec is used.

  [Fix]
  At Linux kernel side, add a Realtek specific quirk to support mSBC.

  At PulseAudio side, send more data frames until the connected device
  sends response.

  [Test]
  Connect different headsets to the said controller, HFP can play and record sounds now.
  Also verified A2DP profile is unaffected.

  [Where problems could occur]
  The kernel part is Realtek specific, so the regression risk is very limited.

  The pulseaudio side only affects HFP profile, since the codeflow only
  changes when a mic is present.

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