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Adjusting brightness by code RRS feed

  • Question

  • Hello everyone,

    i need to write a little system utility to change the brightness of the screen of a 10" tablet with Win8.1.

    My first try was by the Get/SetMonitorBrightness but the function GetMonitorCapabilities() returns -1071241847 that should be error 0xC0262589 ERROR_GRAPHICS_DDCCI_INVALID_MESSAGE_COMMAND . 

    My guess is that the monitor is not compatible.

    Then I try with the registry access to: HKEY_CURRENT_USER, L"Software\\Microsoft\\Windows\\CurrentVersion\\Brightness".

    The value changed but not the brightness: should I have to signal a system event like the WinCE need ?????

    Thanks!


    SteMMo

    Monday, May 25, 2015 2:45 PM

All replies

  • I'm also using the Ioctl calls from Power Management service.

    They do not return errors but the brightness doesn't change ..


    SteMMo

    Tuesday, May 26, 2015 12:53 PM