P2422HE - no DP signal

Hi,

I have two P2422HE on one frame, I plan to use it for two computer.

One PC will be connected via HDMI second via DP.

I plug only one for tests and HDMI works good, where DP no signal (of course DP in).

But under DP appear connector icon which mean it see something plugged to DP.

Does no matter what I plug always there is No DP signal detected.

Second I can not enter monitor menu, it allow me only select the inputs !!! I can do it only on HDMI, on DP connected it is impossible.

Any solution for that? I did factory reset but it change nothing.

Regards