I have my UP3214Q working just fine. You need to A) make the SIMULATED_* monitor settings match the 4K ones; and B) use an HDMI cable along with the displayport

I have my UP3214Q working just fine. You need to A) make the SIMULATED_* monitor settings match the 4K ones; and B) use an HDMI cable along with the displayport cable. My instructions are here: http://jmswrnr.com/blog/the-firmware-issues-of-dell-up3214q-and-up2414q-a00-monitors/#comment-1608588263 http://jmswrnr.com/blog/the-firmware-issues-of-dell-up3214q-...