You might try these tips/tricks at the link below. Be sure to create a restore point on your device before you make any changes, then create another one once the issue is fixed:
http://www.tomshardware.com/answers/id-1764541/volume-low-settings-maxed.html
Also, you may want to follow this next link to Lenovo.com support-drivers and look for audio driver updates for your specific system. Once again, be sure to create a restore point before you make changes, then create a new one once the issue is fixed. Here's the link:
http://support.lenovo.com/us/en/products/Laptops-and-netbooks/100-series/110-15IBR/80T7/000HUS?linkTrack=GPS%253ABody_Search%2BProducts&tabName=downloads&beta=false
8 years, 5 months ago
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Lenovo Product Expert