Change the configuration to Stereo & Connect the 2.1 Speakers!
You'll get proper audio out put!
2.1 is nothing but the stereo output only, in which Subwoofer automatically filters & uses the lower frequency level from the stereo to give you some enhanced Bass Boost.
2.1= 2 speakers & 1 Sub woofer, LEFT & Right!
No separate drivers for 2.1!
audio drivers are just to enable the audio options in you system.
No separate drivers for 2.1, 5.1 & all!