Thank you very much for your great work creating NvAPIWrapper. Among the many other th

Reading EDID? about nvapiwrapper HOT 2 CLOSED

falahati commented on May 27, 2024

Reading EDID?

from nvapiwrapper.

Comments (2)

falahati commented on May 27, 2024

for I2C you need to read DDC documentations. I am not overly familiar with the specifics. isn't 00 FF FF FF the initial bytes to a valid EDID?

well, mine has only one extension block and so Nvidia call returns the full data. so I can't debug it. But you can try sending other offsets to see if it returns more info. check this following code (it is in c# of course) to see if it returns the full edid in your case:

            NVIDIA.Initialize();
            var gpu = PhysicalGPU.GetPhysicalGPUs().First();
            var displays = gpu.GetDisplayDevices();
            var output = displays[1].Output;

            var edid = GPUApi.GetEDID(gpu.Handle, output.OutputId, 0);
            var data = edid.Data.ToArray();
            var identification = edid.Identification;
            var totalSize = edid.TotalSize;
            var offset = edid.DataOffset;

            for (; (totalSize - offset) < totalSize; offset += EDIDV3.MaxDataSize)
            {
                edid = GPUApi.GetEDID(gpu.Handle, output.OutputId, offset, identification);
                if (edid.Identification != identification)
                {
                    // edid changed
                    throw new NotSupportedException();
                }

                totalSize = edid.TotalSize;
                offset = edid.DataOffset;
                var edidData = edid.Data;
                Array.Resize(ref data, data.Length + edidData.Length);
                Array.Copy(edidData, 0, data, data.Length - edidData.Length, edidData.Length);
            }

            var parsed = new EDID(data);