[SRU] [Unstable/OEM-5.6] [PATCH 0/1] Disable Lenovo P620 Rear line-in volume control

[Kai-Heng Feng]

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

This need to apply after "Add initial audio support for Lenovo
ThinkStation P620":
https://lists.ubuntu.com/archives/kernel-team/2020-August/112479.html

[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.

Kai-Heng Feng (1):
  ALSA: usb-audio: Disable Lenovo P620 Rear line-in volume control

 sound/usb/mixer_maps.c | 1 +
 1 file changed, 1 insertion(+)

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2.17.1