Dell UP3214Q stuck at 30hz over DP!

[richard_jones]

Hello,

I have a Dell UP3214Q, 4k screen connected via DisplayPort to a D6000 (over USB-C).

Windows will only allow selection at 30hz in 4k resolution!

I have tried:

A different display port cable
A different display port connection on the monitor
The other display port on the d6000
Disconnecting everything else
Changing the default display driver to the Dell ones (for the monitor)
Re-installing windows
Checking the monitor is in DP1.2 enabled mode.

I also tried the monitor on a different computer with DisplayPort, and it works fine at 60hz so I do not thing its the monitor.

Any ideas anyone!

Thanks
Richard