[ubuntu] Sound issues (working but volume's wrong and buzzing)

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http://ubuntuforums.org – Hello everyone :) I have sound issues with my hp dv6 Ubuntu12.04 laptop. I tested it with : Speakers, bose oe2 headphone, apple headphone, cheap headphone from airlines company. The first issue is that when i play a song on speaker (beats audio) the volume is really much lower than on windows. It's not really a problem but it's strange. The second issue is : When i play a song and the volume is in the red zone i don't hear any song on speaker or any headphone but after the red zone, in the green one the sound is directly quite loud. And the third issue, the really annoyin (Hardware)