I've updated bios. It didn't solve the problem. Speaker still not
working properly.
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
7NETC2WW (2.22 )
03/22/2011
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags removed: bios-outdated-2.22
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https://bugs.launchpad.net/bugs/1324384
Title:
[Lenovo ThinkPad X61s] Speaker volume mutes itself in random intervals
after upgrade to 14.04
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