4K Display problem with Samsung Monitor on Mac Pro

I already had the same problem. I used two of them with a MiniDisplayport to HDMI cable. I had a lot of prolmes. So I called directly Samsung and they told me, that their monitors doens't work bugless by using any kind of adapters (only cables with the same connector on both sides will work). This means you can only use this monitor by using directly a HDMI to HDMI cable on MacPro. They told me that their monitors recognize any kind of adapters as an error source. Sometimes they will work, but sometimes they won't work.

Hope I could help you.

There are many of us having this issue after updating to 10.11.2. Seemed 10.11.1 was slightly better, you could turn the monitor off and back on.

See a post from me here about it:

Link to this post

On this monitor, refresh rate is 30hz for HDMI1, but HDMI2 is 60hz. Unsure why they did that, I suppose to support lower end HDMI devices?

The issue I'm really noticing with this monitor + macbook, is that the mac is unable to control brightness on the monitor, and I can't adjust brightness in the monitor's OSD (and even worse, the OSD menu functionality changes specifically when connected to the mac, in terms of what options are available for modification, and what each directionality executes when using the OSD shortcuts (just pressing up or down shortcuts, changes to a different display input).

Its not on the compatibility list. The Display *****. I had two of them and gave up. The problem you report is noty the only problems which will happen. Try booting into Mavericks and enjoy the ghosting or place your hard drive icons on the right side of the screen and seeing 6 of each. Also the cvolor and brightness don't get it. That start up not showing is a normal aberartion of using a non Apple display. If you had an apple thunderbolt display connected along with that Samsung things would be different and much less of a headache.

It's a real shame Apple won't simply conform so that we can use non-Apple displays with ease.

Aside from the OSD menu issue not functioning properly, I'm not seeing any other real issue with this monitor paired with my Macbook, as the display looks good and performs fine for typical usage. I haven't tested the wake/sleep issue though.

intel352 wrote:

It's a real shame Apple won't simply conform so that we can use non-Apple displays with ease.

Yes! This is what we have to resort to if we want 4k. Apple hasn't updated their Cinema Display in years and is limited to 1.4k...