Public bug reported:

[Impact]
Line-in can't record anything once volume is lower than 80%. 

[Fix]
Line-in in general doesn't have AMP, so disable volume control for it.

[Test]
After applying the patch, line-in can always record sound regardless of
volume.

[Regression Potential]
This fix only affects one specific device, furthermore, there's no
real functional change as the fix itself is a quirk.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: linux-oem-5.6 (Ubuntu)
     Importance: Undecided
         Status: Won't Fix

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
         Status: Won't Fix

** Affects: linux-oem-5.6 (Ubuntu Focal)
     Importance: Undecided
         Status: New


** Tags: oem-priority originate-from-1887882 sutton

** Also affects: linux-oem-5.6 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux-oem-5.6 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Focal)
       Status: New => Won't Fix

** Changed in: linux-oem-5.6 (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1891281

Title:
   Disable Lenovo P620 Rear line-in volume control

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