DisplayPort 1.2 Daisy Chain Third Monitor Not Working

displayportmultiple-monitors

I have:

I am attempting to daisy chain the three monitors together to take advantage of multi-stream transport (MST). When I enable DisplayPort 1.2 mode on the first monitor in the chain, the second monitor gets its own desktop but the third monitor in the chain goes black and shows the standard "no input source". I also get this error message as a result of enabling 1.2 on the monitors. Anyone have experience with getting all 3 monitors to work correctly?

Best Answer

Things to check:

  • The similar U2515H needs to have DP 1.2 enabled, except in the last monitor in the chain which needs to have it disabled. Otherwise Multi-Stream Transport is going to be unreliable or nonfunctional.
  • Your graphics card needs enough throughput on a single port to drive three monitors at whatever resolution you're tring to run them at.
    xrandr --verbose will tell you what monitors the driver detected, what their preferred resolutions and refresh rates are.
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