I've successfully run two external monitors plus the laptop screen using an IBM 
docking station and a fairly modern laptop.  I don't think the resolution was 
1920x1200, more likely 1600x1024.

I've also tried running two external monitors on a docking station for my HP 
ProBook 6560b, but it supports only two (although the docking station has two 
VGA and two DVI ports, and maybe a Displayport port as well).  I've read that I 
need to put an active adapter on the Displayport port to get both externals to 
work in addition to the laptop screen, but I haven't tried that.

--Bob.



Michael Hill via talk – Mon, 12. March 2018 15:23
> On Mon, Mar 12, 2018 at 10:59 AM, Lennart Sorensen
> <lsore...@csclub.uwaterloo.ca> wrote:
> 
> > 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.
> 
> Good to know. If I add a ThinkPad docking station, will anything stop
> me from running *two* monitors at resolutions higher than 1920x1200?
> 
> Mike
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