Not sure if it's unity, or pulseaudio, or whatever.
If your sound card has a volume with an "amplification" part, the indicator do not consider it. For example, if you set the volume with the applet to max, no amplification is selected.
The worst part if that if you set using sound preference some amplification, the applet indicates 100%, but as soon as you touch the indicator, you lose your set amplification, so even you try to rise the volume, it will be reduced.
Binary package hint: unity
Not sure if it's unity, or pulseaudio, or whatever.
If your sound card has a volume with an "amplification" part, the indicator do not consider it. For example, if you set the volume with the applet to max, no amplification is selected.
The worst part if that if you set using sound preference some amplification, the applet indicates 100%, but as soon as you touch the indicator, you lose your set amplification, so even you try to rise the volume, it will be reduced.