power management does not

I thought z500 with windows preinstalled 8, after update to 8.1 windows power management does not.

I can not increase or decrease the brightness of the screen, it is set at the lowest level...

I uninstalled the power management tool and download the latest driver from lenovo site and install it as always the problem persists...

I can only change the brightness when the system starts and lenovo shows...

people of service center can also solve the problem...

can someone help me on the same...

Hello
Download this driver for intel graphics hd
http://support.Lenovo.com/en_US/downloads/detail.page?docid=DS031547
Concerning

Tags: Lenovo Notebooks

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