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Sound works through headphones, but it does not through the speakers.
HOWEVER, at logon, I can hear the drums sound, so it's not a hardware issue.
SOMETIMES, executing "amixer -c0 set Headphone unmute 100%", as adviced in [1], works temporarily.
I had same issue with Fedora 22, see [1] for context.

[1] http://www.forums.fedoraforum.org/showthread.php?t=304857

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
Uname: Linux 3.19.0-21-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  alex       1580 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Jun 22 19:41:55 2015
InstallationDate: Installed on 2015-06-19 (3 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:MID failed
Symptom_Card: Audio Interno - HDA Intel MID
Symptom_Jack: Speaker, Internal
Symptom_Type: Only some of outputs are working
Title: [SATELLITE L750, Conexant CX20585, Speaker, Internal] Playback problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/03/2012
dmi.bios.vendor: INSYDE
dmi.bios.version: 2.80
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Base Board Product Name
dmi.board.vendor: Intel Corp.
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis Manufacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: dmi:bvnINSYDE:bvr2.80:bd07/03/2012:svnTOSHIBA:pnSATELLITEL750:pvrPSK6ME-01900HCE:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
dmi.product.name: SATELLITE L750
dmi.product.version: PSK6ME-01900HCE
dmi.sys.vendor: TOSHIBA

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


** Tags: amd64 apport-bug vivid
-- 
[SATELLITE L750, Conexant CX20585, Speaker, Internal] Playback problem, speakers don't work
https://bugs.launchpad.net/bugs/1467622
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