I've got the two pieces of hardware above. For the dell m4800, it has the i7-4700mq and nvidia quadro k1100m running windows 8/10. Enabling or disabling switchable graphics from the bios doesn't solve the issue below:
When I plug the monitor via displayport directly to my laptop, the monitor is not detected, it never wakes up, and the laptop doesn't see anything. If I use a displayport to dvi adapter, the monitor is seen, but the max resolution is only 1280x720.
What do I do? I know the monitor works and so does the displayport cable, I plug it into another machine and I get my native 1440p resolution just fine.