[Bug 1929371] Re: [SRU] there is always a "Rear Microphone - Built-in Audio" option on the input device list even if the microphone is unplugged

[Sebastien Bacher]

Upload to Impish and Hirsute now, Focal is coming

** Changed in: pulseaudio (Ubuntu)
       Status: Incomplete => Fix Committed

** Changed in: pulseaudio (Ubuntu Hirsute)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1929371

Title:
  [SRU] there is always a "Rear Microphone - Built-in Audio" option on
  the input device list even if the microphone is unplugged

Status in OEM Priority Project:
  Triaged
Status in alsa-ucm-conf package in Ubuntu:
  Fix Released
Status in pulseaudio package in Ubuntu:
  Fix Committed
Status in alsa-ucm-conf source package in Focal:
  New
Status in pulseaudio source package in Focal:
  New
Status in alsa-ucm-conf source package in Groovy:
  New
Status in pulseaudio source package in Groovy:
  New
Status in alsa-ucm-conf source package in Hirsute:
  Fix Released
Status in pulseaudio source package in Hirsute:
  Fix Committed

Bug description:
  [Impact]
  In Lenovo P520, which using a codec for front panel, the other codec for rear panel and both are on a same card.

  In this case, the rear Mic will present on input devices of "Sound
  Settings" even if attaching nothing to rear mic jack.

  [Fix]
  For alsa-ucm-conf part, the Mic 2 should use "Rear Mic Jack" as JackControl because of
  ```
  	control.18 {
  		iface CARD
  		name 'Rear Mic Jack'
  		value true
  		comment {
  			access read
  			type BOOLEAN
  			count 1
  		}
  	}
  ```
  After applying "Rear Mic Jack", the rear Mic will not always there anymore but it's not there as well if hot-plugging audio device on rear mic. Thus, it needs to change pulseaudio to handle if all devices are off cases.

  For pulseaudio, if there is no any audio devices attached, then
  attaching an input device on rear mic jack. The port will not be
  selected automatically because the profiles is off. It needs patch
  pulseaudio to check off profiles (for dual codec case).

  [Test]
  After applying these patches, the rear mic jack works good in all cases (boot without mic and then attach mic, boot with mic and then hotplug it) and other functions (line-in / line-out) work pretty well.

  [Where problems could occur]
  This change only apply the bonus on below cases:
  ```
  if ((has_input_port && found_available_input_port && !has_output_port) ||
      (has_output_port && found_available_output_port && !has_input_port) ||
      (has_input_port && found_available_input_port && has_output_port && found_available_output_port)) 
  ```
  and these cases have been tested.
  If there are some complex codec design then it might cause problem but so far we didn't see that.

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