DELL U2312HM: set display brightness and contrast from Mac

Discussion in 'Mac Pro' started by Caesar_091, Oct 31, 2016.

  1. Caesar_091 macrumors regular

    Caesar_091

    Joined:
    Jan 18, 2005
    Location:
    Italy
    #1
    Hello,

    is there a way to set/modify brightness and contrast levels of my DELL U2312HM via Mac OS as I do with my primary display (Apple Cinema Display 23" HD). I found a windows software (softMCCS) to that and I was wondering if there is a solution for Mac too.

    I'm actually using it with a DVI cable and a DVI to DP adapter (so it is connected using display's DVI port and video board's DP port). My video board is an ATI Radeon HD 5870. Will a different connection change something? HDMItoDP? DVItoDVI?
     
  2. cdf macrumors member

    Joined:
    Jul 27, 2012
  3. Caesar_091 thread starter macrumors regular

    Caesar_091

    Joined:
    Jan 18, 2005
    Location:
    Italy
    #3
    Thanks!

    I've started from that link and arrived to https://github.com/jontaylor/DDC-CI-Tools-for-OS-X and https://github.com/superduper/BrightnessMenulet that are both working with my preliminary tests.
    --- Post Merged, Nov 1, 2016 ---
    I'm now trying to play a bit with ddcctl... I've successfully compiled it but I can't get ti to work.
    This is the syntax this tool is asking:
    Code:
    $ ddcctl -h
    2016-11-01 18:24:45.529 ddcctl[7897:742901] D: NSScreen #69478745 (1920x1200) DPI is 99.00
    2016-11-01 18:24:45.530 ddcctl[7897:742901] D: NSScreen #722493132 (1080x1920) DPI is 96.00
    2016-11-01 18:24:45.530 ddcctl[7897:742901] I: found 2 displays
    2016-11-01 18:24:45.530 ddcctl[7897:742901] Usage:
     ddcctl -d <1-..> [display#]
        -w 100000 [delay usecs between settings]
    ----- Basic settings -----
        -b <1-..> [brightness]
        -c <1-..> [contrast]
    ----- Settings that don't always work -----
        -m <1|2> [mute speaker OFF/ON]
        -v <1-254> [speaker volume]
        -i <1-12> [select input source]
        -p <1|2-5> [power on | standby/off]
        -o [read-only orientation]
    ----- Setting grammar -----
     -X ? (queries setting X)
     -X NN (setting X to NN)
     -X <NN>- (decreases setting X by NN)
     -X <NN>+ (increases setting X by NN)
    $ 
    So how should I select my secondary display (#722493132... the one in pivot mode)?

    For example this code is not working:
    Code:
    ddcctl -d #722493132 -c 100
    
    ...is it my syntax or it is just not working on my config?

    TIA
     
  4. cdf macrumors member

    Joined:
    Jul 27, 2012
    #4
    Try ddcctl -d 1 -c 100 for one monitor and ddcctl -d 2 -c 100 for the other.
     
  5. Caesar_091 thread starter macrumors regular

    Caesar_091

    Joined:
    Jan 18, 2005
    Location:
    Italy

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