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ERROR_GRAPHICS_INVALID_MONITORDESCRIPTOR
ERROR_GRAPHICS_INVALID_MONITORDESCRIPTOR applies to one descriptor record. The WDDM structure carries a pointer, size, descriptor type, ID, and capability origin; all of these must agree with the actual data. For EDID, malformed headers, block lengths, extension counts, or checksums can prevent reliable parsing.
Keep the raw bytes for diagnosis and identify whether they came from the display, firmware override, registry override, or driver-generated data. Do not repair unknown corruption by silently changing advertised timings. A controlled fallback mode may keep a display usable, but it should remain distinguishable from capabilities proven by a valid descriptor.
Descriptor evidence to retain
- Raw bytes and total size exactly as received.
- Descriptor type, ID, and capability origin.
- EDID block index and checksum result where applicable.
- The transport used to read the descriptor and any retry outcome.
Microsoft: monitor descriptor structure
Microsoft: enumerating descriptor records
Linux DRM helpers: reading and parsing EDID
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