What does HRESULT 0xC0262438 (ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER) mean?

ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER

Why this is not a generic GPU failure: graphics not post device driver

Windows reports ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER (0xC0262438) at the linked checkpoint. Here, the starting driver does not correspond to the adapter used for firmware POST display. That narrows the first investigation to boot-display driver continuity instead of the entire GPU stack.

This result: Linked-adapter failures are ordered PnP and power problems. Restarting only the lead member can make the state less consistent and hide the first failing chain device. 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 POST adapter identity, PCI location, loaded driver, boot display flags and adapter LUID. Before diagnosing this result, do not resize, hot-plug, recreate or release the object under examination.
2. Run the narrow this result comparison. compare a normal boot with a configuration that changes the boot adapter or driver binding. 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_DRIVER_MISMATCH is especially useful: ERROR_GRAPHICS_DRIVER_MISMATCH concerns user/kernel graphics driver version compatibility. Recording both names prevents a broad “graphics error” label from merging distinct ownership, capability and lifetime problems.

Safe remediation

Bind the correct display miniport to the POSTed adapter or allow the system to transition through supported handoff logic. 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 boot-display driver continuity 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 device-instance IDs, lead/chain role, PnP problem codes, Dx states and start/power IRP ordering. 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: DirectX graphics kernel subsystem — background for the boot-display driver continuity boundary involved in it.
• Microsoft: WDDM architecture
• Microsoft: Display miniport driver requirements
• Microsoft: Graphics error codes

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