It took me a while to find a way to fix it as all the alsa-mixers where set at 100%.

The solution: run alsamixer -D hw:0 to display a new mixer called “Front” set at 70% by default – shift it to 100% and you can now listen to music or watch a film at a comfortable level!

Ps: If anyone knows how to increase the internal mic input volume and/or make the front mic work on an Dell XPS M1530: I’m definitely interested!