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[ubuntu] Acer Aspire 5920 - shortcut keys and audio output

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http://ubuntuforums.org – The Acer Aspire 5920 notebook on the left side of it there are some shortcut buttons. One is what he calls the default web browser system, for Firefox, but when I press the button that it opens the Nautilus. In other versions of Ubuntu Firefox open properly. The question of sound and works well with excellent volume, the only thing is that once you do anything to go make a sound, he is like a crack that is on the speaker and then the sound comes out. Is there any solution to these problems? (Hardware)