You should simply test it and post your results. Does your computer video card have the full size DP out port or the mini DP out port?

If I connect both of 3 display to the mini DisplayPort I can extend the desktop over all of 3....

I don't think the problem depends fron Displayport or mini Displayport...

But after some times, one monitor disappear like all the other people...

I like to know if the issue afflict all the revision of the display like A02, A03 ecc....

So at the end it's impossible to work with 3 display in chain.... the same it's impossible to work with 2 display in chain... What to do? Thanks.

Which of the three (1st, 2nd, 3rd) drops out? Have you then changed the order to test that problem monitor in a different position in the chain.

Then move that Third one to the front of the chain as DP 1.2. Then move the other two down the chain. See if the issue then starts happening on the different monitor in 3rd position.

The last one that is set to DP 1.1 like you told many times.

Already done... You can change the order of the display, but it's the same.

For me the Dell MST doesn't work... Lot of people have got the same issue.

I like to know if for you it's true or not. if yes pleas let me know wich revision of hardware are affected... and what to do... Thank you.

For all three, what are the 20 digit serial number and revision?

A02 - CN-09TG46-74261-4BC-621L

A02 - CN-09TG46-74261-4BC-5KML

A03 - CN-04VKH6-74261-4CD-3EVL

A02 CN-09TG46-74261-4BC-621L Manufactured 11/12/14

A02 CN-09TG46-74261-4BC-5KML Manufactured 11/12/14

A03 CN-04VKH6-74261-4CD-3EVL Manufactured 12/13/14

Get the A02's exchanged. You will get either A03's or fixed A00, A01, A02.