## Physical Device Driver Reference

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### MOU_UPDATEDISPLAYMODE (51h) - Length

Length An input parameter to VioGetConfig. Length specifies the length of the data structure in bytes including Length itself. The maximum size structure required is determined by issuing VioGetConfig with Length set to 2. When Length is set to 2 on input, VioGetConfig returns the maximum size structure required in the Length field on output. When Length is not equal to 2 on input, the Length field is unmodified on output.