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This question already has an answer here:

Brightness is not remembering it's last state. It make full brightness at every restart. I don't want that, I want my brightness(specific) -echo 50/6.

Just it should remember my last brightness setting by any way.

Note;echo X not working.

My machine is LENOVO G400 Ideapad

marked as duplicate by Eric Carvalho, Community Mar 16 '15 at 19:19

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Here is your answer :

http://www.webupd8.org/2014/10/fix-brightness-getting-reset-to-very.html

Check it..

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