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None of the answers in this same question worked for me. Does anyone have another solution?

The problem is that in reboot screen goes back to 100 per cent bright.

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perhaps you could somehow automate keypresses eg Fn+F2, or automate the move to change the setting. but it might stil be bright for a moment, I haven't tried it. or you could get a vinyl sheet arstechnica.com/civis/viewtopic.php?f=9&t=1193925 neutral density filter solargraphicshome.com/Neutral_Density_Film.html –  barlop Oct 20 '13 at 4:09
I tried this ubuntuguide.net/… and so far it works. –  Zeynel Oct 20 '13 at 9:26
you can post that as an answer, answering your own question, and accept it –  barlop Oct 20 '13 at 12:11

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