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Unfortunately, this question is far too technical and I am unable to find any information on this in my local resources.
I would suggest you address your question to the actual manufacturer of your graphics card.
I can however, confirm that the AMD Display Driver does not have an option to control DP Downspread.
Thank you very much for your answers and advice!
In addition, I have one more question.
Do AMD Graphic card comply with the below contents of Display Port Standard?
220.127.116.11 De-spreading of the Regenerated Stream Clock
Support for down-spreading of the link frequency (with modulation frequencies of 30 kHz or 33 kHz) to
minimize EMI is required for Sink Devices compliant with the DisplayPort specification. Support for
downspreading by Source Devices is an implementation decision and is optional.
A DisplayPort Sink Device must indicate whether it is capable of supporting a down-spread link frequency
in the DPCD by either setting or clearing the MAX_DOWNSPREAD bit.
For a certain Sink Device, such as an audio Sink Device, the regenerated stream clock must not have
Such Sink Devices must perform de-spreading when regenerating the stream clock. The method of
de-spreading is implementation specific.
If you or anyone can not give me answer, Does this question also should be sent to actual manufacturer of my graphic card like my first