iMac Screen Very Dark when using TDM

Discussion in 'iMac' started by RedReplicant, Apr 6, 2015.

  1. RedReplicant macrumors 6502a

    Mar 31, 2010
    I have a 2015 13" MBP that I've connected to my 2012 27" iMac with an official Apple Thunderbolt cable and am trying to use target display mode. It works, but the iMac screen is VERY dark and the keyboard buttons to turn the screen brightness up don't have any effect. I can't seem to find anything about this online.
  2. RedReplicant thread starter macrumors 6502a

    Mar 31, 2010
    Unplugging the cable, reconnecting it, and reenabling target display mode brought the brightness slider back. Weird.


    Apr 6 14:41:55 skylab.local system_profiler[35980] <Warning>: CGSCopyDisplayInfoDictionary: error requesting display info dictionary (0x3e8)

    :) Interesting

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