I have two SP3s (i5 8GB and i7 versions) and 4 Dell U2414h monitors. All updates are installed on both. I use mDP to DP monitor #1 then DP out to DP on monitor #2. At times this works well. Other times only displays on monitor 1, or neither. I do not change the settings at all. It doesn't occur with every reboot or sleep, just intermittently. Most of the time, unplugging all DP cables, and power cycling both monitors seems to fix the problem. I am working as a professional in a medical office and this is just not acceptable.
These Dell monitors seem to be causing problems with other Video cards so I have been focusing most of my support energies on the phone with Dell (and getting nowhere!). My workstation PC (integrated Intel graphics as well p4600) works flawlessly daisy chained with these same monitors though.
Is Microsoft aware of this issue as well? Any chance of a updates graphics driver in the near future to fix this? Is it purely a monitor issue? I've ordered 3 docking stations, will the separate mDP outputs (1 for SP3 and 1 from dock) fix this issue (ie wont be using daisy chain anymore)