I have a new 27"ACD connected to a 27" iMac (2010) and cannot control brightness on the ACD. Also, the option to turn off the ambient light sensor is not available. Tanks for any help.

I have connected a new 27"ACD to a 27" iMac (2010) and cannot independently adjust brightness on the external display. Also, the option for turning off the ambient light sensor is not available. The iMac has the latest updates according to Apple messages. Any help will be appreciated.
P

No, Detect Displays had no effect. However, I made the USB connection from the ACD to the iMac after the system was on. Following a re-start, all controls are available. Thank you for your response.
P

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