What does HRESULT 0xC02625E6 (ERROR_GRAPHICS_PARAMETER_ARRAY_TOO_SMALL) mean?

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An array passed to the function cannot hold all of the data that the function must copy into the array.

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ERROR_GRAPHICS_NO_MONITORS_CORRESPOND_TO_DISPLAY_DEVICE	ERROR_GRAPHICS_INTERNAL_ERROR

ERROR_GRAPHICS_PARAMETER_ARRAY_TOO_SMALL

Locate the failing graphics boundary: graphics parameter array too small

The useful interpretation of ERROR_GRAPHICS_PARAMETER_ARRAY_TOO_SMALL (0xC02625E6) starts at the gdi monitor boundary: the caller-provided array cannot hold every structure the API needs to return. In practical terms, inspect monitor enumeration output array before changing application-wide graphics settings.

A display adapter can be enumerated without being attached to the current desktop or without owning a physical monitor. Keep those states distinct in UI and logs.

Evidence that makes the result actionable

Capture item	Why it matters
Rejected condition	the caller-provided array cannot hold every structure the API needs to return
What to capture	input element count, returned required count, structure size and whether monitor topology changed between calls
Current graph state	GDI display-device enumeration, desktop attachment and physical-monitor mapping
Supporting trace	EnumDisplayDevices snapshot, DISPLAY_DEVICE flags, session ID, HMONITOR list and physical-monitor count
Object identity	monitor enumeration output array

A controlled comparison

Capture the failing state. Record input element count, returned required count, structure size and whether monitor topology changed between calls.
Perform the count query followed by allocation and a second enumeration.

The comparison with ERROR_GRAPHICS_PARTIAL_DATA_POPULATED is especially useful: ERROR_GRAPHICS_PARTIAL_DATA_POPULATED may return usable partial interface-specific data.

Correction and proof

Use the documented two-call pattern and retry once if hot-plug changes the count.

debug-layer, ETW or driver diagnostics no longer report the rejected monitor enumeration output array contract during the same scenario.

Implementation notes

Log EnumDisplayDevices snapshot, DISPLAY_DEVICE flags, session ID, HMONITOR list and physical-monitor count.

Technical references

Microsoft: Multiple display monitors — background for the monitor enumeration output array.
Microsoft: Monitor configuration functions
Microsoft: EnumDisplayDevices
Microsoft: Graphics error codes

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