[Bug 1806532] Re: The line-out on the Dell Dock station can't work

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Title:
The line-out on the Dell Dock station can't work

Status in HWE Next:
New
Status in alsa-lib package in Ubuntu:
Fix Released
Status in linux package in Ubuntu:
Fix Committed
Status in linux-oem package in Ubuntu:
Fix Released
Status in alsa-lib source package in Cosmic:
Fix Committed

Bug description:
[Impact]
On the Dell thunderbolt docs stations (WD15 and WD19), there are two playback
devices, one is headphone, the other is line-out, but there is no UCM for
these docks yet, so the pluseaudio only can handle the 1st playback device,
need us to add the UCM for them, before adding UCM, we need to set the
longname of the sound card in the linux kernel.

[Fix]
For Linux kernel: Cherry-picked 3 upstream patches, these patches add the longname of the sound card for the dock station.

For alsa-lib: Cherry-picked 3 upstream patches from alsa-lib, these will
add ucm configuration files for Dell WD15&19, and change the SPDIF conf
in the USB-AUDIO.conf.

[Test Case]
Open the gnome-sound-setting, we can choose headphone-usb and lineout-usb from
UI, and play sound via these devices

[Regression Potential]
Very low, these patches come from upstream, and the change is only specific
to WD15 and WD19 dock station.

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