Side note: There might actually a better solution in newer kernels: if
you install the daily DKMS package (
https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS ) you will get this
too.

Then edit /etc/modprobe.d/alsa-base.conf and add this line:

options snd-hda-intel jackpoll_ms=250

..then reboot and test. In case the sound card is not the first hda
intel sound card, you might need to add more, like this:

options snd-hda-intel jackpoll_ms=0,250

or

options snd-hda-intel jackpoll_ms=0,0,250

...depending on which card you want to change.

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https://bugs.launchpad.net/bugs/874535

Title:
  Volume Slider Jumps, due to rapidly changing hardware jack sense state

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