[ubuntu] muffled sound/volume levels/hybrid graphics problems

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http://ubuntuforums.org – Hello, I am new to ubuntu, I've installed it recently and there are a few problems with my hardware. Ubuntu version is 12.04 LTS (64 bit) and computer is acer aspire v3-551g-10466G75Makk laptop. 1) First of all, it's my audio. Sound is muffled, like sound source is under blankets. Voices are like in the distance. I can clearly hear the difference between the sound in windows and the sound in ubuntu, especially in heaphones (the sound in speakers is affected too). It doesn't depend on program, I tried flash (youtube), rhythmbox and movie player. What I have already tried to solve the problem: a (Hardware)