Static background noise: Ubuntu 13.04, Kubuntu 13.04; Intel-HDA & ALSA sound driver

A recent update to the pulseaudio package included with Ubuntu 13.04 (Raring Ringtail) and Kubuntu 13.04 may be causing some users to experience a persistent background noise, or hum. It appears that this particular bug will affect VLC, Skype, and possibly other applications which emit audio. This problem is primarily affecting Intel-HDA (high definition audio) chipsets and ALSA sound drivers in regards to "glitch-free" PA (pulse audio).

Below is the current suggested workaround. It requires you to modify a line in the default pulse audio configuration file.

1. Modify the following line in /etc/pulse/default.pa:                                                                                

   

   (Start a session of Terminal and use gedit to edit the pulse audio file.)

      
2. In line 53 of /etc/pulse/default.pa change use_ucm=0 to tsched=0 

     

(The line to edit is line 53)

3. Save Edits and Close the default.pa file.

**bug 751265

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