How do you stop Linux from re-setting the display brightness?

Posted by Shawn J. Goff on Super User See other posts from Super User or by Shawn J. Goff
Published on 2010-03-16T02:08:51Z Indexed on 2010/03/16 7:16 UTC
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linux

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acpi

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brightness

After manually setting the display brightness on my laptop, the system re-sets the value. If the laptop is plugged in, the value is set to full brightness; if it is not plugged in, it is set to dimmer. How do I stop that behavior?

Note that I am not talking about what it does in response to the event of plugging in or unplugging my system. It changes on it's own - usually several minutes after I change the brightness value. I have observed this behavior on different systems, different distributions, and different desktop environments.

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