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ERROR_GRAPHICS_DDCCI_MONITOR_RETURNED_INVALID_TIMING_STATUS_BYTE
Timing-report status is separate from the measured frequencies
ERROR_GRAPHICS_DDCCI_MONITOR_RETURNED_INVALID_TIMING_STATUS_BYTE occurs when the Get Timing Report and Timing Message exchange returns a status value outside the allowed DDC/CI encoding. The horizontal and vertical frequency fields cannot be trusted until the status byte itself is valid.
Capture the entire timing reply and compare it with the current display mode. This error may expose monitor firmware that implements ordinary VCP controls but mishandles the less commonly used timing-report command. Repeating brightness queries does not exercise the same command path. If an adapter or KVM is present, test directly to determine whether it rewrites or truncates the timing packet.
Timing-report diagnostics
- Raw status byte and all accompanying frequency bytes.
- Current resolution, refresh rate, and interlace state.
- Whether other DDC/CI commands succeed on the same connection.
- Result through a direct cable versus the existing signal chain.
References
- Microsoft: GetTimingReport in the monitor API
- Microsoft: exact DDC/CI timing-status HRESULT definition
- VESA: DDC/CI standard availability
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