Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Question:

Question: 4K Display problem with Samsung Monitor on Mac Pro

I'm having trouble with my 4K display on mu Mac Pro. I'm using the Samsung U28E590 display and a MiniDisplay Port to Display Port adapter. Recently, i see that my computer will not properly wake from sleep. I have been on Apple Support multiple times, and have reset RAMs, and tried new cables, but the fact of the matter is that the display "powers" up when awaking from sleep, but the picture never comes on. The only way I can fix it is by changing the wire from one thunderbolt port in the back to another. Then it powers up normally with the picture. Monitor works normally with HDMI, but the refresh rate cuts in half with it. So, has anyone else experienced this and/or found a fix?


Also I note that when booting up, the screen does not show the apple logo and the progress bar. It eventually comes on to the login screen. Sometimes it doesn't come on at all, and I have to change the thunderbolt port again.


This is my second Samsung monitor (different 4K versions). Same issue with both, so I believe its either a Mac issue, or a Samsung technology issue. The cable was switched as well without a remedy.


All apps are up to date, and running El Capitan. - latest version.


Thoughts??

Mac Pro, OS X Yosemite (10.10), 3.5 GHz 6-Core E5 64GB RAM 2x D700

Posted on Dec 8, 2015 10:09 PM

Reply

Mar 21, 2016 6:32 AM in response to ajbrutico In response to ajbrutico

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).

Mar 21, 2016 6:32 AM

Reply Helpful (1)

Mar 21, 2016 11:30 AM in response to ajbrutico In response to ajbrutico

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.

Mar 21, 2016 11:30 AM

Reply Helpful

Mar 21, 2016 11:34 AM in response to DonH49 In response to DonH49

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.

Mar 21, 2016 11:34 AM

Reply Helpful

May 13, 2016 2:54 AM in response to intel352 In response to intel352

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...

May 13, 2016 2:54 AM

Reply Helpful

Apr 1, 2017 12:21 AM in response to ajbrutico In response to ajbrutico

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.

Apr 1, 2017 12:21 AM

Reply Helpful (2)
User profile for user: ajbrutico

Question: 4K Display problem with Samsung Monitor on Mac Pro