If you are using ALSA, amixer can be helpful for your script
programming.
When dropping the amixer --help
command in a terminal you will see
something like this:
Depending on your soundcard, levels may be different than mine, but
you can use alsamixer
in the terminal in order to check which levels
and which features in your sound card you can call in a command to set
the volume as you wish.
In my example, with my principal sound card (I have 2: the embedded
and a PCI audio card), levels are from 0 to 100, this way I can change
the volume of a desired input/output in my soundcard by dropping in a
terminal the next command:
amixer -c 0 set Front 50DB
amixer -c 0 set Front 64DB
In the first command, the result will set the Front panel output to
78% level and the second one will set the Front panel output to 100%
level.
In order to gather information related to your mixer controls, drop
the amixer
command with no parameters and you will get a list. Or
indicate which audio device you wish to see a list of controls with
amixer -c X
(where "X" is the number of your audio device).
BTW: Remember that DB values are calculated logarithmically and not
linearly.
Remember that this command allow you to control parameters on whatever sound device you are currently using.
Best Answer
You should have a setting called Over-Amplification in Settings > Sound. Turning it on and adjusting the volume slider above it will only get you to 100%, but you can still adjust beyond 100% by using either your keyboard's volume buttons if available, or adjusting the volume slider in the corner of your screen.