Having similar problems with a Toshiba NB200. As a point of interest here is 
when the problem started.
Installed 14.04 from scratch. Did the updates. Installed Gnome Flashback. Sound 
working perfectly at this stage, even after several log outs.
Installed 'libtiff4' via the archives as it was needed to install Canon 
printerdrivers for MG4200 series. Sound still working at htis stage.
Log out. Still getting sound when switching between accounts which are chosen 
at log in screen.
Log in, and now no sound.
Insert headphones and notice playback device in 'Sound Settings' changes to 
headphones, and sound can be heard.
Unplug headphones and device changes back to speakers, and voila ......... 
sound through the speakers until I log off.
Log back in, and only way to get sound working is to plug, then unplug 
headphones.

Could this be a fault in initialisation of the sound on a user account?
ie. defaulting to headphones

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1320020

Title:
  [Inspiron 1470, Realtek ALC272, Speaker, Internal] No sound at all

Status in “alsa-driver” package in Ubuntu:
  Confirmed

Bug description:
  I can get perfect sound through headphones, and the kernel recognizes
  the internal speaker, but nothing is ever played through it. I have
  personally tested a pair of earbuds to make sure that sound could play
  through the headphone port, and that isn't a problem. The sound driver
  just refuses to recognize the existence of the speaker, even though
  the kernel does.

  I wouldn't be surprised if the last upstream update had something to
  do with it.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  isiah      7361 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Thu May 15 18:07:52 2014
  InstallationDate: Installed on 2014-01-29 (106 days ago)
  InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Release amd64 
(20131017)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel failed
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  isiah      7361 F.... pulseaudio
  Symptom_Jack: Speaker, Internal
  Symptom_Type: No sound at all
  Title: [Inspiron 1470, Realtek ALC272, Speaker, Internal] No sound at all
  UpgradeStatus: Upgraded to trusty on 2014-05-04 (11 days ago)
  dmi.bios.date: 03/23/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0M7CYJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A05
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A05
  dmi.modalias: 
dmi:bvnDellInc.:bvrA05:bd03/23/2011:svnDellInc.:pnInspiron1470:pvrA05123:rvnDellInc.:rn0M7CYJ:rvrA05:cvnDellInc.:ct8:cvrA05:
  dmi.product.name: Inspiron 1470
  dmi.product.version: A05123
  dmi.sys.vendor: Dell Inc.

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