[xubuntu] Sound output to headphones not working

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http://ubuntuforums.org – I am using Xubuntu 12.10 fully updated on an HP 200-5220a. I have a Hi-Fi system plugged into the headphones output. This has worked without any problems for nearly two years until the last 2 or 3 days. Then the sound output stopped. I think I may have reset something somewhere! I can correct the problem by going into the Menu > Multimedia > PulseAudio Volume Control. Under the Output Devices tab the Port setting shows "Speakers" If I change this to "Headphones" everything works OK as expected. Problem is that this setting change does not get saved and sho (Hardware)