Tested on one Lenovo and one Dell machines, they all use legacy HDA
audio driver. Upgraded the g-c-c to 0buntu2, plug a hdmi/dp monitor, we
could see the hdmi-stereo from the configuration combo list and audio
worked well. Without this SRU, users will see the empty configuration
combo list and need users manually select profile.

Verified done on focal.
 

** Tags removed: verification-needed verification-needed-focal
** Tags added: verification-done verification-done-focal

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https://bugs.launchpad.net/bugs/1896919

Title:
  [SRU] g-c-c: The hdmi/dp profiles are not set automatically in the
  combo list after selecting the hdmi/dp audio in the g-c-c

Status in HWE Next:
  New
Status in OEM Priority Project:
  Confirmed
Status in gnome-control-center package in Ubuntu:
  Fix Released
Status in gnome-control-center source package in Focal:
  Fix Committed
Status in gnome-control-center source package in Groovy:
  Fix Released

Bug description:
  [Impact]
  After we plugging a hdmi/dp monitor with audio capability, we could
  select hdmi audio as output device in the g-c-c, but after we do
  that, the profile combo list will show up in the g-c-c and this combo
  list is empty, it should be stereo-hdmi by default according to 18.04

  [Fix]
  Backport a fix from g-c-c upstream, after applying this patch, the
  combo list update signals will be recevied after the pa finishes the
  changing active profile.

  [Test Case]
  Plug the hdmi/dp monitor with audio capability, then choose hdmi audio
  as active output device from g-c-c, we will find the profile combo list
  has hdmi-steoreo as the default profile. This is same as 18.04.

  [Regression Risk]
  It is possible to make the output and input device can't work after
  applying this patch, that is because the active profile is not set as
  our expected. But this possibility is very low, I tested this patch on
  2 lenovo and 2 dell laptops, there is no regression.

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