The newer lenovo laptops like Thinkpad Edge 15, Edge E320 and X121e have only one 3,5mm 4 pin port for earphones and microphone.
Pin
Number
Pin
Name
Description
1 L  Left
2 R  Right
3 G  Ground
4 M  Mic

Compatible with a ipad/iphone earphone.

According to 13 reports in our database (12 positive and 1 negative) this pinout should be correct.

Is this pinout
Lenovo Thinkpad Edge & X Series Notebook audio visual pinout:
Lenovo Thinkpad Edge & X Series Notebook audio diagram
click to enlarge
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