On Fri, Mar 09, 2018 at 04:00:27PM -0500, Michael Hill via talk wrote:
I have a ThinkPad T450 with Intel 5500 graphics that I was happy connecting to an inexpensive Samsung monitor at home and a Dell P2815Q at the office using an HDMI-to-mini-DisplayPort adapter. The Dell just runs at 3840 resolution and the Samsung at 1920.
I inherited a Dell U3011 last week to use at home and it has a maximum resolution of 2560x1600. When I connect it to the ThinkPad DisplayPort using the existing HDMI adapter or a new DVI adapter, all I can get is 1920x1200. Can I ever get the higher resolution, with or without a docking station?
Passive displayport to hdmi or DVI adapters are only single link, and to use DVI to get 2560x1600@60Hz requires DVI dual link. As you have found out, native displayport on the other hand works. Another option with be an active displayport to dual link DVI adapter. Also the HDMI is single link on the monitor so no adapter could ever make the monitor do more than 1920x1200@60Hz using HDMI input on the monitor. The HDMI input on that monitor only existed to allow connecting a bluray player or other similar device at 1920x1080. It was not for computer use. -- Len Sorensen