[Bug 1903048] Re: [SRU] Bluetooth won't activate on the pi 400

[William Wilson]

@seb128 it turns out Dave had already forwarded the patches, so I
included the URLs in this new debdiff

@vanvugt I set the version to ubuntu3.1 rather than ubuntu4

** Patch added: "Focal SRU"
   https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1903048/+attachment/5477676/+files/lp1903048_focal.debdiff

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Title:
  [SRU] Bluetooth won't activate on the pi 400

Status in bluez package in Ubuntu:
  Fix Released
Status in bluez source package in Focal:
  In Progress
Status in bluez source package in Groovy:
  Fix Released
Status in bluez source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

  Without these patches, Bluetooth is inoperable on the recently
  released Raspberry Pi 400.

  [Test Case]

  * Boot the Ubuntu Desktop for Pi image on a Pi 400.
  * Start the Settings application and switch to the Bluetooth tab
  * Verify that Bluetooth is not enabled and attempting to activate it fails
  * Enable the -proposed repository for the release (groovy)
  * sudo apt update
  * sudo apt install bluez
  * sudo reboot
  * Start the Settings application and switch to the Bluetooth tab
  * Verify that Bluetooth is active and that Bluetooth devices (e.g. mice, mobile phones, headphones, etc.) can connect and operate correctly

  [Regression Potential]

  Extremely low (on groovy in particular, this has the same version of
  bluez as hirsute). The only significant risk is to non-Pi platforms or
  dongles which also use the Broadcom 43xx (or Cypress 305) chips for
  Bluetooth which might be inadvertently affected by these patches.

  [Original Description]

  The new Pi 400 has a slightly different Wifi/BT chip to the Pi4.
  Whilst wifi works happily, Bluetooth fails to operate. This doesn't
  appear to be an issue with either the firmware (the latest versions
  from upstream Raspbian have been tried), or the kernel (a known-good
  raspi kernel has been tested under Ubuntu), but with Bluez itself.
  Specifically, tracing the initialization with btmon on Raspbian and
  Ubuntu, the stack consistently fails when attempting to "Set Default
  PHY" on the latter. Curiously, under Ubuntu the adapter also appears
  to lack a MAC address.

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