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How to increase brightness in smaller steps?

I have a Lenovo Thinkpad T60 running Oneiric. According to the files in /sys/class/backlight, I should be able to adjust the brightness level to a number between 0 and 7 (and I am able to do this successfully in terminal using

echo 4 > /sys/class/backlight/acpi_video0/brightness

). However, when using the keyboard button (Fn+Home, Fn+End), the brightness levels adjust by increments of three. For example, if the brightness is all the way up at 7 and I press the button once, it lowers to 4, then again to 1, then 0. I would like to change this so that it changes in increments of 1. E.g. It starts at 7, lowers to 6, then 5, and so on. Ideas?

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marked as duplicate by Tom Brossman, devav2, hexafraction, Jorge Castro, Eliah Kagan Oct 9 '12 at 0:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

I researched this awhile ago, but there seemed to be no easy solution. The reason, as I vaguely remember, it skips is that FN+* is getting sent twice for a hardware-related reason. Basically, the keyboard event is sent twice and the brightness always increments by 2 levels. – Hemm Sep 28 '12 at 4:52

1 Answer 1

I'm not sure about those numbers, but on my HP laptop I used xbacklight to change my brightness. The brightness varies between 0 and 100 and pressing the brightness up/down keys changes the brightness by 10. I wanted something like five, so I mapped a key to the command

xbacklight -inc 5


xbacklight -dec 5

You might be able to use this as a workaround to your problem.

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