Why am I so small voice of the microphone?

My sound card is CMI8738, why plug in a microphone after such a small voice, the sound quite able to open a little microphone to hear the voice of the microphone is good, in other computers with no problems, and I in the audio settings, The microphone is open to the greatest voices, or, how the case ah?

Small speaker in the lower right corner attributes There is a option A microphone, where the volume of the tune? “In the tool tray in the lower right corner of the small speakers, double-click inside after a number of settings, which you all have a single volume boost.If it is not the one, do you consider a change drive I think your system 8 as GHOST version of the system, direct-driven auto-loading.This system is often encountered in a number of special sound card driver version out when this happens.You can try.

Qi in Lenovo technicians.