View source for Sound does not work on Sony VAIO VPCEC1M1E

'''Problem:'''
* After installing Linux on a Sony VAIO VPCEC1M1E, the sound card is recognized correctly but the sound does not work.

'''Solution:'''

* This is a known bug. For more details, see [https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/537448/].
* To solve this issue, you have to modify a sound card key using hda-analyzer [http://www.alsa-project.org/main/index.php/HDA_Analyzer].
* Get the basic ''run.py'' script:
 wget -O run.py http://www.alsa-project.org/hda-analyzer.py
* Execute it:
 python run.py
* Go to ''Node[0x19] PIN'' (left hand side pane) -> ''Widget Control'' (right hand side pane) -> change the value of ''VREF'' to ''HIZ''.