Tempotary fix.
1) Put the notebook to sleep mode.
2) After wake up sound level is correct.
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https://bugs.launchpad.net/bugs/1597280
Title:
[SVS1512Z9EB, Realtek ALC275, Black
Architecture: amd64
AudioDevicesInUse:
USERPID ACCESS COMMAND
/dev/snd/controlC0: hoofoo 1877 F pulseaudio
CurrentDesktop: GNOME
Date: Wed Jun 29 13:37:49 2016
InstallationDate: Installed on 2016-06-18 (10 days ago)
InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus"