TP540p win8.1 update light problems?

Hello

update my new TP540p to win8.1 and problem awaken.

I can not change the brightness and cannot turn out to fall asleep (System don't wake fuly, no picture just sound).

After uninstall drivers and download brand new lenovo site support nothing has changed.

I followed the tutorial on change of Microsoft Basic graphics card and the only idea that has happened is that when I press buttons for the brightness in the upper left icon showing that I do this, but light itself does not change.

Help please?

Thanks in advance.

EDIT:

Just trying to get back on the Intel back card and I lose information in the upper left corner on the use of keyboard shortcuts.

SOLUTION:

(1) disable the automatic installation of the driver.

(2) delete the directory called drivers in c:\DRIVERS

(3) remove drivers and check the delete option in the device for two graphics cards Manager.

(4) install official drivers for lenovo to WIN8.1 site

(5) make the coffee and relax the frustration

Tags: ThinkPad Notebooks

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