Unable to turn down display brightness

I just unboxed a new Macbook, and I am unable to reduce the display brightness. Neither the keyboard brightness (f1) nor the slider in system prefs > display work; you can pull the slider down, but then it bounces back to full brightness. Has anyone else seen this?

If you have the ambient light sensor on and are under bright lights, that could be the outcome. You can turn off the ambient sensor to see if that is the issue. The check box for this is right below the slider you referenced.

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Last edited by DKOI (2011-12-24 16:44:45)

DKOI wrote:I thought that enviroment doesn't matter because system turn off display even if X isn't started.
I just installed pm-utils and acpid. Wrote handler on closing laptop and nothing else. So I can not imagine why it goes offline...
the lack of a desktop environment is also useful information.
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Good day,
+First of all sorry for my english.+
I have issues with display on my tecra w50-a-114. *Display sometimes (ca in 5min. period) blink (brightness go on 100% and then back to the current settings).*
I dont know whats happened. I am not aware that I changed some settings. I check all power management settings, but every setting is in my opinion alright.
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Hi
I guess the display brightness level changes no matter if the notebook is connected to the AC adaptor or battery mode? Is this correct?
Usually the function keys FN + F7 and FN + F8 increases and decreases the computers brightness.
But I dont think that theses function could be related to your issue.
To me it sounds a little bit like display panel hardware problem but this is only my personal opinion

Unable to turn down display brightness

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