[Bug 1921915] Re: Bluetooth controller not detected on CM4

[Brian Murray]

Hello Dave, or anyone else affected,

Accepted pi-bluetooth into groovy-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/pi-
bluetooth/0.1.15ubuntu1.1~20.10.1 in a few hours, and then in the
-proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
groovy to verification-done-groovy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-groovy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: pi-bluetooth (Ubuntu Groovy)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-groovy

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https://bugs.launchpad.net/bugs/1921915

Title:
  Bluetooth controller not detected on CM4

Status in pi-bluetooth package in Ubuntu:
  Fix Released
Status in pi-bluetooth source package in Focal:
  In Progress
Status in pi-bluetooth source package in Groovy:
  Fix Committed
Status in pi-bluetooth source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

  Without these patches, Bluetooth is inoperable on the CM4

  [Test Case]

  * Boot the Ubuntu Desktop for Pi image on a CM4.
  * Start the Settings application and switch to the Bluetooth tab
  * Verify that Bluetooth is not enabled and attempting to activate it fails

  [Regression Potential]

  The main concern would be the backported versions of pi-bluetooth not
  integrating well with other packages. We are mitigating this concern
  by also SRUing Bluez and linux-firmware-raspi2 to focal and groovy.

  [Original Description]
  Under later versions of the Ubuntu kernel (5.8) on the CM4 and (possibly?) some models of the Pi 400, the bluetooth controller is not activated by the pi-bluetooth package. This appears to be due to two issues:

  * The mmcnr device is mistaken for a bluetooth controller. This in
  itself is harmless, but results in a spurious hci0 device. The
  existence of this device causes the btuart script to skip configuring
  the "real" bluetooth device (as it thinks it is already configured)

  * The btuart script also attempts a match against the device-tree's
  model name looking for "Raspberry Pi 4" which doesn't match "Raspberry
  Pi Compute Module 4".

  The upstream repository currently has commits for both these fixes but
  no release has been made yet. It is proposed to backport these patches
  into an -ubuntu2 version of the package in the meantime.

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