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manwong78
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xps 9550 with dock tb15 cannot dual display 4k resolution on 2 x dell U2717D monitors

From my laptop xps 15 9550, i couldn't figure out how to extent properly 4k resolution on each monitor.

If I refer the dell website, I am supposed to be able to dual display 4k resolution on each monitor:

http://www.dell.com/support/article/us/en/19/SLN301105

Dell Thunderbolt Dock TB15
Resolutions Number of Displays Refresh Rate
1920 x 1080 3 60 Hz
1920 x 1200 3 60 Hz
2048 x 1356 3 60 Hz
2560 x 1080 3 60 Hz
2560 x 1440 3 60 Hz
2560 x 1600 3 60 Hz
3440 x 1440 2 60 Hz
3840 x 2160 2 60 Hz

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)

Thanks

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