AlsaMixer missing master channel no sound

[Kyle Mercer]

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

[Kyle Mercer (kyle413)]

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.

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for alsa-driver (Ubuntu) because there has been no activity for 60 days.]