This document provides 3 methods to guide users on how to mute their speakers.
The above symptom is associated with, but not limited to, the following systems:
IdeaPad 100, MIIX series
Click on the speaker icon on the right hand corner near the clock. Then click the speaker icon to mute.
Open Charms Bar, click on Settings. Then click the speaker icon to mute.
Press F1 key to Mute/unmute the sound.