What does HRESULT 0xC026258D (ERROR_GRAPHICS_MONITOR_NO_LONGER_EXISTS) mean?

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.

This result: Physical monitor handles are not durable identifiers. They become stale after topology changes and must never be persisted or reused across enumeration generations. The built-in one-line message identifies the immediate result; diagnosis also needs the producing API, object ownership and the display generation current at the time.

The smallest evidence set

Preserve the unsigned HRESULT, symbolic name, first failing API and timestamp in one record. If cleanup later fails too, keep that secondary result separately from this result.

A/B test for the exact condition

1. Freeze the result generation. Record handle acquisition time, PnP removal, mode change, docking event, HMONITOR mapping and current enumeration. Before diagnosing this result, do not resize, hot-plug, recreate or release the object under examination.
2. Run the narrow this result comparison. remove or reconfigure the monitor after obtaining a handle, then reacquire and repeat. During the result comparison, keep every driver, monitor, resource format and unrelated policy unchanged.
3. Observe the layer after it. for it, if the exact check passes, record the next HRESULT or visible outcome. A different downstream result shows that the boundary was crossed.
4. Repeat it through a lifecycle transition. for it, exercise one relevant resize, mode switch, device recreation, hot-plug or session change and confirm that it does not reuse stale handles.

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. Recording both names prevents a broad “graphics error” label from merging distinct ownership, capability and lifetime problems.

Safe remediation

Discard all monitor handles on topology changes and enumerate the current physical monitors. Repair of it is complete only when the original call succeeds or returns its documented nonfatal status and the same lifetime test remains correct after a second display transition.

• The result trace identifies one producing API and one current graphics object, rather than only the final UI symptom.
• The passing run changes exactly the condition described for it; unrelated adapter, monitor and application state remains unchanged.
• debug-layer, ETW or driver diagnostics no longer report the rejected physical monitor object existence contract during the same scenario.
• The application handles recurrence of it without an unbounded retry loop, leaked resource, duplicate composition target or stale topology handle.

Implementation notes

Log physical-monitor handle generation, monitor description, VCP feature, DDC/CI exchange and display-change timestamp. When the path returns a count, size, status flag or replacement object, retain it even on a nonfatal result because it can direct the next call.

A production fallback for it should be explicit: pause rendering, re-enumerate, rebuild one cache entry, recreate a device, or decline a protected path only when this layer calls for that action. Reinstalling every display component, deleting all caches or forcing a resolution change is not an evidence-based fix for it.

Technical references

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

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