Whatever I tried several as combinaisons in extended desktop, i cannot get the 4K (but only the 2K max) at 59/60hz, i cannot even get the 4k in 30hz available in the HD graphics control panel: Primary display : dell 1 u2717d
Secondary display : dell 2 u2717d
Built-in display : laptop xps 15 9550 in on or none
Do you guys have the same issue ? or anyone already solved it ?
(The TechCenter asked me to use mDP and DP instead of using mDP and HDMI, the issue remains the same fyi whatever the combo between mDP, DP and HDMI)