Public bug reported:

After the mainline kernel was patched with 'serdev: Add ACPI support'
(commit 53c7626356c7584e82510d86394a6dcd80525614) and 'serdev: enable
TTY port controller support by default' (commit
22b276a4072087e7b7f1723ccd8a1aa18fab8bbf) and 'Bluetooth: hci_bcm: Add
serdev support' (commit 33cd149e767be9afbab9fcd3d5165a2de62313c8) the
mainline kernel the config needs CONFIG_SERIAL_DEV_BUS=m changing to
CONFIG_SERIAL_DEV_BUS=y and CONFIG_BT_HCIUART_BCM=y to keep sound and BT
working on Intel Atom devices.

Currently the latest Ubuntu config for 4.15 (see 0006-configs-based-on-
Ubuntu-4.15.0-2.3.patch) still only has CONFIG_SERIAL_DEV_BUS=m

The config needs to be update to take into consideration the
implications of the aforementioned patches together with the settings
identified.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1739939

Title:
  Update Ubuntu-4.15.0 config to support Intel Atom devices

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