[Precision T1700, Realtek ALC3220, Green Line Out, Rear] Speakers not recognized

[Ryan Schuetzler]

Computer speakers are not being recognized in sound settings. As long as nothing else is plugged in, I still get sound through the speakers, but they are not shown under "Output" in sound settings. In fact, nothing is shown under Output, but the speakers will play sound just fine.

When I plug in my USB Yeti microphone (which has a headphone jack), it shows up under "Output" in sound settings and I cannot get sound to come through the speakers.

Info:
Ubuntu 16.04

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: ryan 2153 F.... pulseaudio
 /dev/snd/controlC1: ryan 2153 F.... pulseaudio
 /dev/snd/pcmC0D0p: ryan 2153 F...m pulseaudio
 /dev/snd/controlC0: ryan 2153 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Jun 13 09:22:58 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-12-11 (184 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Green Line Out, Rear
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: None of the above
Title: [Precision T1700, Realtek ALC3220, Green Line Out, Rear] Playback problem
UpgradeStatus: Upgraded to xenial on 2016-04-22 (52 days ago)
dmi.bios.date: 02/02/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 048DY8
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA15:bd02/02/2015:svnDellInc.:pnPrecisionT1700:pvr01:rvnDellInc.:rn048DY8:rvrA01:cvnDellInc.:ct6:cvr:
dmi.product.name: Precision T1700
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.