Why sound does not show loudness correctly?

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http://askubuntu.com – When I turn down the volume it reaches a point when it doesn´t sound at all, but the volume indicator showed on screen hasn´t reached the mute. And max volume doesn´t sound as high as windows 7. I´m using ubuntu 11.10, in a DELL E6420 laptop. (optimus disabled) lspci -nn | grep Audio 00:1b.0 Audio device [0403]: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller [8086:1c20] (rev 04) 01:00.1 Audio device [0403]: nVidia Corporation HDMI Audio stub [10de:0e08] (rev a1) (HowTos)