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I can confirm that it works for me with ig-platform-id 0x591b0000. Connected via Displayport with HiDPI-1440p@60Hz! (Monitor Dell P2415Q) Thank you so much :) First screenshot was with ig-platform-id 0x59200000, the other two is now with 0x591b0000.

Thank you, the Displayport works now! :) Unfortunately I can still only choose non-HiDPI 1440p in the display preferences menu. See the attached screenshot ('niedrige Auflösung' means 'low resolution'). Any idea how I can get the 4k Resolution scaled with factor (2/3) to get a scaled HiDPI 1440p...

Really appreciate your help! :) Edit: The attached EFI folder is the one from the efi partition, not that one visible on the screenshot inside /Library/.

Done. Has anyone an idea what I could try to get the Displayport working?

I got exactly the same hardware like erik. However, nearly everything seems to work on High Sierra 10.13.4 with the files from the first post, except for the Displayport. Has anyone the same problem? While connected through the displayport, I can reach 2/3 from the boot before my display (DELL...