[Bug 1956855] Re: [SRU] alsa-ucm-conf: Add Realtek 4050 USB Codec profile for a Dell machine

[Hui Wang]

** Description changed:

- This bug is for tracking purpose.
+ [Impact]
+ This Dell machine has dual Realtek 4050 USB Codecs as front and rear codec, the front codec has speaker and headset, the rear codec has line-out audio jack. Without UCM, the pulseaudio can't detect this two usb audio codec and the audio can't work at all.
+ 
+ [Fix]
+ Backport a upstream patch, the patch adds the front and rear profiles in the ucm, then pulseaudio will enable all audio devices in this machine.
+ 
+ [Test]
+ booting with patched ucm, open the gnome-sound-setting, we could see usb speaker, usb headset and usb lineout, play sound to speaker, headset and lineout, all worked well, record sound via headset, it could record the sound correctly.
+ 
+ [Where problems could occur]
+ This SRU adds the new ucm files to a folder, in theory it will not introduce regressions, but It adds a file USB-Audio.conf, it could make other ucm conf files in the USB-Audio folder fail to parse, and make the P620 and WD15/19's audio fail to work, but this possibility is very low, we already tested it and no regression found so far.

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https://bugs.launchpad.net/bugs/1956855

Title:
  [SRU] alsa-ucm-conf: Add Realtek 4050 USB Codec profile for a Dell
  machine

Status in HWE Next:
  New
Status in alsa-ucm-conf package in Ubuntu:
  In Progress
Status in alsa-ucm-conf source package in Focal:
  In Progress
Status in alsa-ucm-conf source package in Impish:
  In Progress
Status in alsa-ucm-conf source package in Jammy:
  In Progress

Bug description:
  [Impact]
  This Dell machine has dual Realtek 4050 USB Codecs as front and rear codec, the front codec has speaker and headset, the rear codec has line-out audio jack. Without UCM, the pulseaudio can't detect this two usb audio codec and the audio can't work at all.

  [Fix]
  Backport a upstream patch, the patch adds the front and rear profiles in the ucm, then pulseaudio will enable all audio devices in this machine.

  [Test]
  booting with patched ucm, open the gnome-sound-setting, we could see usb speaker, usb headset and usb lineout, play sound to speaker, headset and lineout, all worked well, record sound via headset, it could record the sound correctly.

  [Where problems could occur]
  This SRU adds the new ucm files to a folder, in theory it will not introduce regressions, but It adds a file USB-Audio.conf, it could make other ucm conf files in the USB-Audio folder fail to parse, and make the P620 and WD15/19's audio fail to work, but this possibility is very low, we already tested it and no regression found so far.

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