Can't adjust brightness on Samsung RV420 with fn keys

Posted by nicholascamp on Ask Ubuntu See other posts from Ask Ubuntu or by nicholascamp
Published on 2012-07-14T23:18:53Z Indexed on 2012/12/07 11:19 UTC
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Filed under:

kernel

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brightness

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samsung

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function-keys

Typing ls /sys/class/backlight/*/brightness outputs

/sys/class/backlight/intel_backlight/brightness
/sys/class/backlight/samsung/brightness

The max_brightness for the second is 8, but changing it with echo 2 | sudo tee /sys/class/backlight/samsung/brightness doesn't change brightness. I can do it by using intel_backlight: echo 2000 | sudo tee /sys/class/backlight/intel_backlight/brightness (max_brightness: cat /sys/class/backlight/intel_backlight/max_brightness outputs 4648).

But I want to do this work with the fn brightness keys, as I always did. I don't know what happened to stop working, maybe the use of +1 monitor and removing it in a wrong time or a system update.

I'm using Ubuntu 12.04 64 bits in an Samsung RV420 notebook. Kernel Version is 3.2.0-27-generic.

Could you help me? Please tell me what more info should I provide.

Thanks!

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