I am doing DisplayPort comparability test.
I found Desktop PC included Video card detect right resolution but the some laptop PC which has mini DP or USB-C doesn't output video signal due to detect wrong resolution. My DP core is non GUP mode so I can't find the problem. I guess the reason of trouble is in DP Link training sequence.
Can you recommend how to solve the problem ?
I understand in the past you had some issues with your custom board. Then you fixed your board issue and DisplayPort is working after that.
It's not clear to me on your this latest reported issue with DisplayPort compatibility test. Kindly clarify further
Assuming your board signal quality is good now, then there are 3 possibility that I think can affect the test result