** Description changed:

- this bug is for tracking purpose.
+ [Impact]
+ On the Dell WD15/19 Dock station, there is a USB audio card, and
+ a headset audio jack routes to this audio card. We found if we plug
+ some specific headset (non-iphone type headset), we could not record
+ any sound from headset-mic even we set the input volume to max.
+ 
+ [Fix]
+ Improve the ucm for the audio card in this Dock, let the driver mixer
+ value be adjustable, then we could adjust the input volume from driver
+ side. 
+ 
+ [Test Case]
+ plug various types of headset to the WD19 and WD15 dock stations, and
+ adjust the input volume from gnome, check the input volume in the driver
+ by running amixer, found the input volume is changed in the driver;
+ record the sound from headset-mic, it could record the sound from all
+ headsets we tested.
+ 
+ [Regression Risk]
+ It could make the PA fail to load the ucm on the machines with Dell
+ WD15/WD19 dock station, then users only see analogue output/input from
+ gnome-control-center instead of usb-speaks usb-lineout and usb-mic.
+ But this possibility is very low since we have tested the patch on WD15
+ and WD19 dock, all worked very well.
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https://bugs.launchpad.net/bugs/1893004

Title:
  alsa-ucm-conf: the volume can't be adjusted on the usb audio of the
  Dell WD15/WD19 dock

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