[Bug 1921915] [NEW] Bluetooth controller not detected on CM4

[Dave Jones]

Public bug reported:

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.

** Affects: pi-bluetooth (Ubuntu)
     Importance: Undecided
     Assignee: Dave Jones (waveform)
         Status: New

** Affects: pi-bluetooth (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: pi-bluetooth (Ubuntu Groovy)
     Importance: Undecided
         Status: New

** Affects: pi-bluetooth (Ubuntu Hirsute)
     Importance: Undecided
     Assignee: Dave Jones (waveform)
         Status: New

** Changed in: pi-bluetooth (Ubuntu)
     Assignee: (unassigned) => Dave Jones (waveform)

** Also affects: pi-bluetooth (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: pi-bluetooth (Ubuntu Hirsute)
   Importance: Undecided
     Assignee: Dave Jones (waveform)
       Status: New

** Also affects: pi-bluetooth (Ubuntu Groovy)
   Importance: Undecided
       Status: New

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

Title:
  Bluetooth controller not detected on CM4

Status in pi-bluetooth package in Ubuntu:
  New
Status in pi-bluetooth source package in Focal:
  New
Status in pi-bluetooth source package in Groovy:
  New
Status in pi-bluetooth source package in Hirsute:
  New

Bug 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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