What does HRESULT 0xC0262438 (ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER) mean?

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Description:

The driver trying to start is not the same as the driver for the POSTed display adapter.

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ERROR_GRAPHICS_INCONSISTENT_DEVICE_LINK_STATE	ERROR_GRAPHICS_ADAPTER_ACCESS_NOT_EXCLUDED

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.

ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER: Linked-adapter failures are ordered PnP and power problems. For ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, Restarting only the lead member can make the state less consistent and hide the first failing chain device. For ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, 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

Capture item	Why it matters for `ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER`
Decisive capture	POST adapter identity, PCI location, loaded driver, boot display flags and adapter LUID
Current graph state	lead adapter, chain members and their PnP/power transitions
Supporting trace	device-instance IDs, lead/chain role, PnP problem codes, Dx states and start/power IRP ordering
Object identity	boot-display driver continuity
Rejected boundary	the starting driver does not correspond to the adapter used for firmware POST display

For ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, 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 ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER.

A/B test for the exact condition

Freeze the ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER generation. Record POST adapter identity, PCI location, loaded driver, boot display flags and adapter LUID. Before diagnosing ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, do not resize, hot-plug, recreate or release the object under examination.
Run the narrow ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER comparison. compare a normal boot with a configuration that changes the boot adapter or driver binding. During the ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER comparison, keep every driver, monitor, resource format and unrelated policy unchanged.
Observe the layer after ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER. For ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, if the exact check passes, record the next HRESULT or visible outcome. A different downstream result shows that the ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER boundary was crossed.
Repeat ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER through a lifecycle transition. For ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, exercise one relevant resize, mode switch, device recreation, hot-plug or session change and confirm that this result 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. For ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, 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 ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER 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 ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER 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 ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER; unrelated adapter, monitor and application state remains unchanged.
For ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, 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 ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER without an unbounded retry loop, leaked resource, duplicate composition target or stale topology handle.

Implementation notes for `ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER`

For ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER, log device-instance IDs, lead/chain role, PnP problem codes, Dx states and start/power IRP ordering. When the ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER 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 ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER 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 ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER.

Technical references

Microsoft: DirectX graphics kernel subsystem — background for the boot-display driver continuity boundary involved in ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER.
Microsoft: WDDM architecture — background for the boot-display driver continuity boundary involved in ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER.
Microsoft: Display miniport driver requirements — background for the boot-display driver continuity boundary involved in ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER.
Microsoft: Graphics error codes — background for the boot-display driver continuity boundary involved in ERROR_GRAPHICS_NOT_POST_DEVICE_DRIVER.

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