Ubuntu 14.04 Sound Glitch
Solution 1:
Here's the generic fix for Realtek audio that usually fixes a number of issues. Grab yourself a terminal and enter the following line -
sudo gedit /etc/modprobe.d/alsa-base.conf
Add this on a new line at the end of the configuration file -
options snd-hda-intel model=generic
Save and restart your computer.
If that doesn't work, repeat the same but change model=generic to model=auto