arky, as per http://support.lenovo.com/en_US/downloads/default.page? an
update is available for your BIOS (2.54). If you update to this, does it
change anything?

If not, could you please both specify what happened, and provide the output of 
the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

** Tags added: bios-outdated-2.54 needs-upstream-testing regression-
potential

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1194947

Title:
  Power management: Audio codec

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