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ERROR_GRAPHICS_CLIENTVIDPN_NOT_SET
Locate the failing graphics boundary: graphics clientvidpn not set
The useful interpretation of ERROR_GRAPHICS_CLIENTVIDPN_NOT_SET (0xC026235C) starts at the vidpn boundary: no client-originated VidPN has been set for the adapter in the current session. In practical terms, inspect user-mode client VidPN state before changing application-wide graphics settings.
Evidence that makes the result actionable
| Capture item | Why it matters |
|---|---|
| What to capture | adapter LUID, client type, prior mode-change calls, session state and current active VidPN |
| Current graph state | VidPN, topology, source and target mode sets, and the present path connecting them |
| Supporting trace | source and target IDs, topology generation, path descriptors, pinned modes, mode-set handles and monitor timing data |
| Object identity | user-mode client VidPN state |
| Rejected condition | no client-originated VidPN has been set for the adapter in the current session |
A controlled comparison
- Capture the failing state. Record adapter LUID, client type, prior mode-change calls, session state and current active VidPN.
- Perform a documented user-mode display change and repeat the client-VidPN query.
The comparison with ERROR_GRAPHICS_NO_ACTIVE_VIDPN is especially useful: ERROR_GRAPHICS_NO_ACTIVE_VIDPN means the adapter itself lacks an active VidPN.
Correction and proof
Treat the state as absent data and fall back to active/system topology where appropriate.
- debug-layer, ETW or driver diagnostics no longer report the rejected user-mode client VidPN state contract during the same scenario.
Technical references
- Microsoft: Introduction to Video Present Networks — background for the user-mode client VidPN state.
- Microsoft: VidPN objects and interfaces
- Microsoft: Enumerating cofunctional VidPN modes
- Microsoft: Determining VidPN support
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