What does HRESULT 0xC02625E2 (ERROR_GRAPHICS_DISPLAY_DEVICE_NOT_ATTACHED_TO_DESKTOP) mean?

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The function failed because the specified GDI display device was not attached to the Windows desktop.

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ERROR_GRAPHICS_NO_DISPLAY_DEVICE_CORRESPONDS_TO_NAME	ERROR_GRAPHICS_MIRRORING_DEVICES_NOT_SUPPORTED

ERROR_GRAPHICS_DISPLAY_DEVICE_NOT_ATTACHED_TO_DESKTOP

What Windows rejected: graphics display device not attached to desktop

The useful interpretation of ERROR_GRAPHICS_DISPLAY_DEVICE_NOT_ATTACHED_TO_DESKTOP (0xC02625E2) starts at the gdi monitor boundary: the named display device exists but is detached from the current Windows desktop. In practical terms, inspect desktop attachment state of a GDI display device before changing application-wide graphics settings.

Build a useful diagnostic record

Capture item	Why it matters
What to capture	DISPLAY_DEVICE flags, current DEVMODE position, session, active paths and recent display changes
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	desktop attachment state of a GDI display device
Rejected condition	the named display device exists but is detached from the current Windows desktop

Separate state from capability

Capture the failing state. Record DISPLAY_DEVICE flags, current DEVMODE position, session, active paths and recent display changes.
Attach the display through supported configuration APIs and repeat with the same current name.

The comparison with ERROR_GRAPHICS_NO_DISPLAY_DEVICE_CORRESPONDS_TO_NAME is especially useful: ERROR_GRAPHICS_NO_DISPLAY_DEVICE_CORRESPONDS_TO_NAME means name resolution itself failed.

Verify the repaired path

Branch explicitly for detached devices instead of assuming every enumerated adapter has an active desktop surface.

debug-layer, ETW or driver diagnostics no longer report the rejected desktop attachment state of a GDI display device contract during the same scenario.

Implementation notes

Technical references

Microsoft: Multiple display monitors — background for the desktop attachment state of a GDI display device.
Microsoft: Monitor configuration functions — background for the desktop attachment state of a GDI.
Microsoft: EnumDisplayDevices
Microsoft: Graphics error codes

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