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Can't adjust screen brightness from anywhere. Nor by specific buttons on the laptop keyboard, nor by setting in "brightness and lock"

I've tried to configure the grub file like it mentioned in a lot of instruction, but noe success.

When I'm pressing the brigtness buttons on a keyboard I get a bar appeard on screen but there's only two positions and no any actual brightness changes (((

Unfrtunately couldn't attache images due to lack of reputation (

Do somebody knows how to fix it ?

Thanks in avdvance.

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Please list the make and model of your computer. Different makes models have different solutions sometimes. –  mchid Aug 18 '14 at 10:27
Please also include the output of uname -a I had this same problem during kernel 3.13.0-32 –  Charles Green Aug 18 '14 at 13:09
sorry for a stupid question guys... but how to "list the make and model of your computer." ?? )... I'm a quite new in all of that stuff. Thanks for your understanding. –  Andrew Sakharoff Aug 19 '14 at 13:44

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