Public bug reported:

No input or output devices appear in Sound Settings unless HDMI is
plugged in.  So the audio card is working but not detecting the onboard
audio inputs or outputs for some reason.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-generic 3.19.0.23.22
ProcVersionSignature: Ubuntu 3.19.0-23.24-generic 3.19.8-ckt2
Uname: Linux 3.19.0-23-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  tudor      1774 F.... pulseaudio
Date: Fri Jul 24 17:27:39 2015
HibernationDevice: RESUME=UUID=3acb1340-1be5-453c-a918-25f6b6ff404e
InstallationDate: Installed on 2015-07-06 (17 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
MachineType: Dell Inc. Venue 11 Pro 7140
ProcEnviron:
 LANGUAGE=en_AU:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-23-generic 
root=UUID=f0dc97e1-7d1c-4d05-a7d8-3cfc8551bdc4 ro quiet splash 
i915.i915_enable_rc6=1 "acpi_osi=!Windows 2013" vt.handoff=7
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-23-generic N/A
 linux-backports-modules-3.19.0-23-generic  N/A
 linux-firmware                             1.143.2
SourcePackage: linux
SystemImageInfo:
 current build number: 0
 device name: 
 channel: daily
 last update: Unknown
UpgradeStatus: Upgraded to vivid on 2015-07-07 (17 days ago)
dmi.bios.date: 06/30/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA07:bd06/30/2015:svnDellInc.:pnVenue11Pro7140:pvr01:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Venue 11 Pro 7140
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

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


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1477859

Title:
  Onboard Audio not working on Dell Venue 11 Pro 7140

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