Automatically adjust brightness - Missing

I have a user complaining of the brightness level changing continuously. I researched and identified Automatically adjust brightness needed to be disabled. When I went to disable it, I found it was missing. I researched that, but couldn't find anything about that. I did find that older iMac models wouldn't have that feature, but we purchased this hardware last year. Is that too old? Anyone have any ideas?
- OS X version: 10.9.4 (13E28)
- iMac 27-inch , Late 2013
- NVIDIA GeForce GT 755M 1024 MB

Where did you look to disable the feature. It's in the System/Displays/Display preference pane:
If the checkbox is not there Boot into the Recovery volume (boot with the Command + R keys held down), select Disk Utility and repair disk permissions and the disk. Reboot normally and try again If that fails reboot into the Recovery volume again and reinstall the system.

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You could even both “set the brightness all the way up” and “disable Automatically adjust brightness” with just one and the same script:
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If it's unique to mine, I should probably get it fixed...
Message was edited by: sdfisher

It is just how things are. However, some sort of software fix could probably improve it! I own another monitor with a light-sensor, and these just seem to be sensitive, especially in low light.
Take in considerations that it monitors the light continuously. If you are in a dark room, you will be lit by the display. So if you move around, the amount of light on you (and thereby the amount of light sensed by the sensor) will change. Resulting in some weird behavior.
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- Have a nice day

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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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Automatically adjust brightness - Missing

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