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Thread: How to control Apple Cinema Brightness control for Dell XPS 14 running Ubuntu 10.10?

  1. #1
    Join Date
    Nov 2011
    Posts
    60

    How to control Apple Cinema Brightness control for Dell XPS 14 running Ubuntu 10.10?

    Well I am having Dell XPS 14. It is displaying 2560x1440 resolution on the 27" Cinema Display. I have found that there is no way to control the brightness of the display. I am running Ubuntu 10.10, 64-bit. Is there any way to control brightness of Cinema Display for non Apple computers?

  2. #2
    Join Date
    Nov 2010
    Posts
    1,614

    Re: How to control Apple Cinema Brightness control for Dell XPS 14 running Ubuntu 10.10?

    Looking at the situation you will need to use acdcontrol. You can get the same from the third part website.
    You have to patch acdcontrol with below mentioned code.

    Code:
    *** acdcontrol.cpp~     2007-04-05 07:41:50.000000000 -0700
    --- acdcontrol.cpp      2011-01-03 00:53:42.000000000 -0800
    ***************
    *** 59,64 ****
    --- 59,65 ----
      const int CINEMA_DISPLAY_20_NEW           = 0x9219;
      const int CINEMA_DISPLAY_24               = 0x921e;
      const int CINEMA_DISPLAY_30               = 0x9232;
    + const int CINEMA_DISPLAY_27               = 0x9226;
      
      const int S1                              = 0x8002;
      
    ***************
    *** 540,545 ****
    --- 541,548 ----
                                           "Apple Cinema Display 24\"" ));
        supportedDevices.insert( DeviceId( APPLE, CINEMA_DISPLAY_30,
                                           "Apple Cinema HD Display 30\"" ));
    +   supportedDevices.insert( DeviceId( APPLE, CINEMA_DISPLAY_27,
    +                                      "Apple Cinema HD Display 27\"" ));
      
        supportedDevices.insert( DeviceId( SAMSUNG, S1,
                                           "Samsung SyncMaster 757NF" ));

  3. #3
    Join Date
    May 2011
    Posts
    1,665

    Re: How to control Apple Cinema Brightness control for Dell XPS 14 running Ubuntu 10.10?

    If you wanted to find current brightness then you will need to use below mentioned code.
    Code:
    ~/apple/acdcontrol-0.4$ sudo ./acdcontrol /dev/usb/hiddev0 
    Apple Cinema and Studio Display Control Program. Please, use --about switch to learn more
    hiddev driver version is 1.0.4
    /dev/usb/hiddev0: BRIGHTNESS=285
    In order to change the brightness you will need to use below mentioned code.
    Code:
    ~/apple/acdcontrol-0.4$ sudo ./acdcontrol /dev/usb/hiddev0  600
    Apple Cinema and Studio Display Control Program. Please, use --about switch to learn more
    hiddev driver version is 1.0.4

  4. #4
    Join Date
    May 2011
    Posts
    1,860

    Re: How to control Apple Cinema Brightness control for Dell XPS 14 running Ubuntu 10.10?

    Another thing I would like to comment apart from the above mentioned code you should set factory setting to auto-adjust according to ambient lighting conditions. If acdcontrol is not working then also you will be able to get acceptable brightness. Valid brightness values is seems to be 0 (darkest) to 1011 (brightness). If you set to 1011 or higher will not make any issue but I don’t recommend to do so.

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