Cannot adjust the brightness of the screen and the sleep will not work Satellite P750/P755

On my P750/P755 Satellite I am unable to adjust the brightness of the screen.
I can move the scale but nothing is happening on the screen.

Also in the last two days not possible in mode "sleep" as it did before, even though I haven't changed anything.

What did you do with your computer laptop last days?
On this virtual path, it is not possible to say what the problem is here.
You have installed updates? I mean all this can happen without reason?

Have you tried to roll back the OS to an earlier time to check the functionality?
And Yes, do you use the original pre-installed OS that you got with your laptop?

Tags: Toshiba

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