Communication protocol on DDC/CI

Question

Hi,
I posted a monitor API question in another forum.
https://learn.microsoft.com/en-us/answers/questions/210041/low-level-monitor-api.html

I want to send customization DDC/CI protocol instead of using general VCP code.
For example protocol of adjusting LCD brightness : 07 00 4D 43 43 02 23 81 3F 3F

How do I implement the function in my application program using WDK (DeviceIOControl) function ?

thanks
Rick

Answer 1

Hello,

• Windows API only supports communicating with the monitor via VCP codes defined in MCCS (Monitor Control Command Set) via APIs listed here
• A monitor vendor can define their own vendor specific VCP code as per the VESA MCCS spec to implement unique commands
• We do not support sending arbitrary bytes of data to the monitor and if the requirement of the vendor can’t be satisfied with vendor specific VCP codes then it is not supported on Windows