Lenovo L420 wakes up from sleep after upgraded to Windows 8

I have a Lenovo Thinkpad L420, which I have recently upgraded to Windows 8 (it was purchased with Windows 7 installed).  Now, the computer will be no wake mode 'sleep', I need to restart everytime I try to wake up from its sleep.

Hi all, thought I'd post an update. As MadsDad said, Yes, there is a new BIOS that resolves this problem. I finally got a blockage of an engineer at Lenovo and we worked together to build the new BIOS. This update solves also sporadic freezing problems than some models also known. Its here
http://support.Lenovo.com/en_US/downloads/detail.page?docid=DS013626

Tags: Windows

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