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
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