[Bug 1881094] Re: Support kernel 5.4 Intel sound driver on bionic

[Hui Wang]

@Kai-Chuan,

To be safe, could you please apply the change to a LENOVO machine and
test if it works or not. Dell DMIC machines depends on the soundcard's
name to work while Lenovo DMIC machines depends on soundcard's long name
or BIOS Rev string to work. I remember there is a LENOVO X1C7 in Taipei
office, and a couple of weeks ago this machine was kept by Kaiheng. If
your change could work on LENOVO X1C7, it means all LENOVO DMIC machines
could work.

thx.

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Title:
  Support kernel 5.4 Intel sound driver on bionic

Status in OEM Priority Project:
  New
Status in pulseaudio package in Ubuntu:
  Invalid
Status in pulseaudio source package in Bionic:
  Triaged

Bug description:
  [Impact]

   * Some Intel platform bionic user audio function will be broken after
  upgrade to kernel 5.4

   * pulseaudio can't find working profile, since card name is changed
  in kernel 5.4

  [Test Case]

   * install kernel 5.4 and check audio function
     1. enable Pre-released updates in Developer Options
        Software & Updates > Developer Options > Pre-released updates (bionic-proposed)
     2. $ sudo apt update
     3. $ sudo apt install linux-generic-hwe-18.04-wip
     4. $ sudo reboot

   * install updated linux-firmware and pulseaudio
     $ sudo add-apt-repository ppa:kchsieh/training
     $ sudo apt-get update
     $ sudo apt install linux-firmware
     $ sudo apt install pulseaudio
     $ sudo reboot

   * test items
     1. check internal speaker/mic to playback and record audio
     2. plug headset and check headset functions
     3. plug HDMI from external monitor/TV, and check audio functions
     4. 1, 2, 3 works fine after resume from suspend

  [Regression Potential]

   * The updated pulseaudio breaks audio function on old kernel

  [Scope]

   * Need for bionic only

  [Bug Discussion]

   * https://bugs.launchpad.net/timbuktu/+bug/1880632
   * MP: https://code.launchpad.net/~kchsieh/pulseaudio/+git/bionic-1880632/+merge/384610

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