Why Does My iMac Keep Setting the Screen Brightness to 'Full'?

Posted by TomB on Super User See other posts from Super User or by TomB
Published on 2009-09-11T18:42:12Z Indexed on 2010/04/06 22:03 UTC
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osx

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imac

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snow-leopard

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multiple-monitors

I have a 2 week old 24" iMac running Mac OS X 10.6. It is the primary monitor with the menu bar on the top of display. I have an external monitor as well, a 19" Viewsonic LCD. The LCD is set to the left side of the iMac, rotated 90 degrees CCW and has the Dock along the far left edge.

When I restart the screen brightness on the iMac reverts to Full brightness. The Viewsonic LCD retains the setting I have for it. I am using a Mini DVI to DVI cable for the external display.

I even tried setting my Huey Pro to do automatic screen adjustment based on ambient lighting but the iMac still goes to stun with a reboot.

I am sure it is something dumb I have overlooked.

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