This appears to be a known problem. The Lenovo Forums have some suggestions at [B]this [/B]link.
Just found a supposed fix for this issue. [B]FIX LINK[/B] [B]Caution[/B], I do not know this site so if they ask for a payment so you can get the required driver, [B]DO NOT PAY[/B]. Make a Restore Point BEFORE installing the Utility software to facilitate easier removal of the software in case it is crap.
Mods, please remove the above link if the site supplies sux. Ta.