This is probably an issue with your ALSA sound level settings. There are two main volume settings: PCM and Master. Usually only one of them is controlled via desktop GUI settings (you can select which one that is in your audio settings).
If you run
alsamixer in your terminal, check the volume levels for both of them. If you can't find the system setting to select the default volume control mechanism, try this:
- open up
alsamixer in your terminal
- change the volume using your desktop controls and notice, which
alsamixer setting is changed
alsamixer, increase the level of the other volume control (i.e. If "PCM" was changed while you changed volume from the GUI, then increase "Master" in
Note: You exit
alsamixer using the Esc key.