Comment 11 for bug 84505

 I am running a Inspiron 9300. The Master volume seems to control the two main speakers (located on the front edge) and the Master Mono controls the subwoofer (located on the bottom of the unit). I have found that setting System - Preferences - Sound to control just the PCM is a decent work-around. I then go into the Volume control and set the Master and Master Mono levels at the correct value. This allows you to control the amount of bass from the master mono channel and have it set at a consistent level.

I would also like to confirm what localhost was saying. My original install of feisty was an upgrade from edgy. Using this install I never had this problem. Only after performing a fresh reinstall did this problem occur.

Details can be provided upon request.