HRESULT 0xC026258D (ERROR_GRAPHICS_MONITOR_NO_LONGER

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The operating system asynchronously destroyed the monitor which corresponds to this handle because the operating system's state changed. This error typically occurs because the monitor PDO associated with this handle was removed, the monitor PDO associated with this handle was stopped, or a display mode change occurred. A display mode change occurs when windows sends a WM_DISPLAYCHANGE windows message to applications.

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ERROR_GRAPHICS_INVALID_PHYSICAL_MONITOR_HANDLE	ERROR_GRAPHICS_DDCCI_CURRENT_CURRENT_VALUE_GREATER_THAN_MAXIMUM_VALUE

ERROR_GRAPHICS_MONITOR_NO_LONGER_EXISTS

Why this is not a generic GPU failure: graphics monitor no longer exists

ERROR_GRAPHICS_MONITOR_NO_LONGER_EXISTS, value 0xC026258D, is produced by monitor when the monitor PDO or display configuration changed after the handle was obtained. The investigation should stay attached to physical monitor object existence and to the exact generation in which it was obtained.

Physical monitor handles are not durable identifiers. They become stale after topology changes and must never be persisted or reused across enumeration generations.

The smallest evidence set

Capture item	Why it matters
Supporting trace	physical-monitor handle generation, monitor description, VCP feature, DDC/CI exchange and display-change timestamp
Object identity	physical monitor object existence
Rejected condition	the monitor PDO or display configuration changed after the handle was obtained
What to capture	handle acquisition time, PnP removal, mode change, docking event, HMONITOR mapping and current enumeration
Current graph state	HMONITOR-to-physical-monitor enumeration and DDC/CI transaction

A/B test for the exact condition

Capture the failing state. Record handle acquisition time, PnP removal, mode change, docking event, HMONITOR mapping and current enumeration.
Remove or reconfigure the monitor after obtaining a handle, then reacquire and repeat.

The comparison with ERROR_GRAPHICS_INVALID_PHYSICAL_MONITOR_HANDLE is especially useful: ERROR_GRAPHICS_INVALID_PHYSICAL_MONITOR_HANDLE can also be caused by caller lifetime mistakes without device removal.

Safe remediation

Discard all monitor handles on topology changes and enumerate the current physical monitors.

debug-layer, ETW or driver diagnostics no longer report the rejected physical monitor object existence contract during the same scenario.

Implementation notes

Log physical-monitor handle generation, monitor description, VCP feature, DDC/CI exchange and display-change timestamp.

Technical references

Microsoft: Using high-level monitor configuration functions — background for the physical monitor object existence.
Microsoft: High-level monitor configuration API
Microsoft: GetMonitorCapabilities
Microsoft: Graphics error codes

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