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How can I make the brightness change in smaller increments?

I red this before (How to increase the screen brightness control sensitivity?), but I didn't find the solution to help in my case.

My laptop brightness is controlled by vendor specified hotkey (Fn+ & Fn+), so there is no interface for OS (Ubuntu 12.10) to adjust brightness.

When I try to adjust, the slider moves by steps of 40% (0-40-80-100 & 100-60-20-0). Is there a way to set the steps by 20%?

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I did it by setting acpi_osi= instead of acpi_osi="!Windows2012" Now it works.

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Can you elaborate on this answer? – Eric Carvalho Nov 4 '13 at 12:03

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