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ERROR_GRAPHICS_INVALID_FREQUENCY
ERROR_GRAPHICS_INVALID_FREQUENCY (0xC026230A) means a video-signal timing supplied for a VidPN target mode has an invalid frequency value. This concerns the timing model used to drive an output, not merely a requested desktop refresh rate.
Timing values must agree
A target mode combines pixel rate with horizontal and vertical timing. The visible region, blanking intervals, and total scan dimensions determine which horizontal and vertical rates are possible. A value copied from a different timing record, rounded inconsistently, or calculated with the wrong unit can produce a structurally invalid signal even when the visible resolution looks plausible.
What to inspect
- Trace the origin of the mode: EDID detailed timing, DisplayID data, a driver-generated CVT or GTF timing, or a fixed panel timing table.
- Verify that pixel clock, horizontal rate, vertical rate, active size, and total size describe the same scan format.
- Re-evaluate clone configurations: a signal mode may be valid for one target but not cofunctional with the shared source and another target.
- For a miniport, keep frequency validation before the mode is exposed through the target mode set, rather than failing after the path has been committed.
Do not confuse this with link bandwidth alone
An output link can have enough bandwidth and still reject a malformed timing. Conversely, a well-formed timing can later fail because of link or monitor limitations. This status points at the internal validity of the timing description.
VESA E-EDID: supported timing and display characteristics
Microsoft: cofunctional VidPN mode enumeration
Microsoft: graphics status codes
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