OPM and ChangeDisplaySettingsEx
Because applications can alter analog content protection (ACP) levels by calling the Microsoft Win32 ChangeDisplaySettingsEx function, the display miniport driver should ensure that adjustments to the ACP protection type through ChangeDisplaySettingsEx are independent of adjustments made by the IOPMVideoOutput interface. In other words, if the ACP protection type is set on the physical connector through the display miniport driver's DxgkDdiOPMConfigureProtectedOutput function, the display miniport driver should not permit disabling the ACP protection type on the physical connector through a IOCTL_VIDEO_HANDLE_VIDEOPARAMETERS request. Note that user-mode calls to ChangeDisplaySettingsEx initiate IOCTL_VIDEO_HANDLE_VIDEOPARAMETERS requests to the display miniport driver.
For more information about the ChangeDisplaySettingsEx function, see the Microsoft Windows SDK documentation.
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