Hi,
I've got three Dell U2719D (2450x1440, 60Hz, DP1.4).
I can connect one monitor to the computer (RX580) with a DisplayPort 1.4 cable, connect the second monitor to the first one (DisplayPort 1.4 cable) and they both work as expected.
However, if I connect the third monitor to the second one only two of them have a signal.
All of them work - I can disconnect, in the display settings, one of the two that's working and connect the third one. So the problem doesn't seem to be the monitors as they all work.
It seems RX 580 is not supporting daisy chain of three monitors.
Thanks!