trying to use an external mic with latitude c810. mic works ok but unable to adjust input level.

 

from double-click speaker icon and 'options/properties', selected recording and 'show volume control' for mixer/cd audio/line in/mic/aux/linein2/mic2/etc...

 

slider control for mic2 input shown but grayed out (as is line in2, analog stereo and analog mono)

 

i am logged in with administrator privileges.

 

any ideas?