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[Kyle Mercer <kyle413@xxxxxxxxx>]

Booted into recovery mode via grub and the sound worked as expected.
Then I booted normally and the sound works again. So as far as I am
concerned this bug can be closed. I'm not sure if that something I
can/should do though.

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Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1367879

Title:
  AlsaMixer missing master channel no sound

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

Bug description:
  Yesterday (9/09/2014) I updated Ubuntu base via Software Updater and
  now my sound does not work out of built in laptop speakers or the
  headphone jack.

  The Sound Settings (unity-control-center sound) does not show any
  devices.  AlsaMixer, after F5 (show all) has 2 channels I can change
  PCM and Digital, I swear there used to also be a master channel (and
  maybe others) before.

  
  !!ALSA/HDA dmesg
  !!--------------

  [   32.107581] rtl8188ee: Using firmware rtlwifi/rtl8188efw.bin
  [   32.110126] snd_hda_intel 0000:00:1b.0: irq 44 for MSI/MSI-X
  [   32.133993] ppdev: user-space parallel port driver
  --
  [   33.056274] systemd-udevd[493]: Error calling EVIOCSKEYCODE: Invalid argument
  [   33.121275] hda-intel 0000:00:1b.0: Codec #0 probe error; disabling it...
  [   33.317093] init: failsafe main process (756) killed by TERM signal
  --
  [   33.410581] rtlwifi: wireless switch is on
  [   33.437669] input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input17
  [   33.437748] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input16
  [   33.437810] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input15
  [   33.454987] Linux video capture interface: v2.00

  
  More info:
  http://askubuntu.com/questions/522277/no-sound-after-ubuntu-base-update
  http://www.alsa-project.org/db/?f=cbf6b64acdde8c2f2d3a24cae453b4f2817e8a1e

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