B580 HDR issue in DIY Monitor

[Mr_Tadokoro]

I am encountering an issue with my Intel B580 GPU when using a DIY display setup. The display consists of a panel (AUO B160QAN02.2) and a pass-through board connected via eDP interface. The pass-through board links to the GPU via DisplayPort (DP)

This pannel support 10bit color + 240Hz +HDR. But the GPU only provides a 6-bit depth potion at 240Hz refresh rate. If forcing 10-bit color by Intel Graphics Command Center, the system automatically enables HDR and locks the refresh rate to 60hz, the display exhibits a washed-out/grayish appearance unless HDR is manually enabled.

The same setup works flawlessly with an NVIDIA GPU, it allowing simutaneous 10-bit, HDR, 240Hz refresh rate without issues.

when using a commercially available display, B580 dose not exibit the aforementiones issue and can support 10-bit color with HDR at 240Hz.

[Mr_Tadokoro]

I have tried the iGPU(UHD770), it has the same issue with B580. So it seems that whatever the DP1.4 or DP2.1 is not the root cause.

I have learned to use the CRU and aim to Inject correct HDR static metadata (e.g., min/max luminance values) . Are there recommended CRU settings for Intel GPUS to fix HDR gamma mapping?

[MUC]

CRU is essentially just a graphical user interface and influences the behavior of the graphics driver via the operating system's own EDID override mechanism.

Background information:

• Microsoft Learn > Windows Hardware Developers > Design > Component Guidelines > Display > Display Descriptors
• Microsoft Learn > Windows > Drivers > Display > Monitor EDID Overrides

Your monitor's EDID already contains valid and plausible information:

Color Characteristics

    Red: 0.6611 | 0.3300

    Green: 0.2832 | 0.6171

    Blue: 0.1425 | 0.0537

    White: 0.3134 | 0.3291

---------------

HDR Static Metadata

Electro optical transfer functions:

• Traditional gamma - SDR luminance range
• SMPTE ST2084

Supported static metadata descriptors: Static metadata type 1

• Desired content max luminance: 107 (507.620 cd/m²)
• Desired content max frame-average luminance: 107 (507.620 cd/m²)
• Desired content min luminance: 71 (0.394 cd/m²)

Bending this data via CRU is essentially the same as creating a Windows color profile with the HDR Calibration App. However, since that doesn't seem to resolve the issue, I don't think we've identified the root cause yet.