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ERROR_MONITOR_UNKNOWN_DESCRIPTOR_FORMAT
ERROR_MONITOR_UNKNOWN_DESCRIPTOR_FORMAT means that descriptor bytes were returned, but the component that received them cannot interpret their format as a supported monitor descriptor. This is different from a missing descriptor and from a recognized EDID block whose checksum is invalid.
What to inspect
- Record the block identity and type, not just a decoded monitor name. Windows exposes these fields with the raw block through
WmiMonitorRawEEdidV1Block. - Separate an EDID base block from a block map or another extension. A parser designed for the 128-byte base structure must not treat a different extension layout as the same data.
- Compare the capture through a direct HDMI or DisplayPort connection with the capture through any intermediary device that may substitute descriptor data.
Do not alter the timing values first. Format recognition must succeed before standard timings, detailed timings, or text descriptors can be trusted.
Microsoft: raw E-EDID block type and identity
VESA: Enhanced EDID structure and extension blocks
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