Mac Pro Late 2013 and Samsung 4k monitor problem

I'm not 100% positive of the settings, since I don't have the AMD card anymore. But I'm pretty sure all I did was create a custom resolution CVT-RB simplified settings w/ a 50Hz refresh rate, leaving the default settings for horizontal sync (pos) and vertical sync (neg). Then save, reboot, and use SwitchResX to select the new 50Hz mode.

You might need to create the scaled resolutions if you want 50Hz versions of the lower resolutions (hidpi) - I just run mine at native, so I can't remember the steps involved, though I remember something about having to create 2x resolutions of each resolution you want. There might be more info at the switchresx website or forums....

BTW: Does the nMP give a boot image on a 4k single-stream monitor?

I can confirm that setting the screen to 50Hz with SwitchResX does in fact get rid of the distortion issue. This is much better than default with distortion.

This is the settings the app created when I set the Hz on Vertical to 50Hz

This thread might help. Looks like you need to create a custom, "scale resolution" of 5120x2880. Haven't tested yet, but this sounds like what I remember - you should end up with a 5120x2880 mode, and a 2560x1440 hidpi mode.

http://forums.macrumors.com/showthread.php?t=1568657

You might also want to disable all the 60hz resolutions in the "current resolutions" tab - if you use the switchresx menu to swap resolutions, it'll cut down on the number of options to sort through.

chriskuta wrote:

The engineer clearly doesn't have all the information. I'm using my U28D590 right now on my Late 2013 Mac Book Pro and it works perfectly even using an older mini display port to display port cable. Its an AMD driver / signal issue. The MBP puts out a clean 3840x2160 @ 60Hz horz. 133.3khz vert. and it was like a quarter the price of the MP.. 😠

Right, the MBP uses either Intel integrated or NVIDIA graphics (isn't external video always using NVIDIA graphics?). Since the monitor works with that, then there's a problem with the AMD graphics or with the AMD drivers.

romanheym wrote:

II'm using samsung monitor with new Mac Pro with D300 graphics and it also works fine. No artifacts on the screen in 60hz - no need to modify edid file. It could be actually AMD problem with the drivers. Of course for us is all Apple who is to blame. But for sure I wouldn't say it's samsung fault.

Another user in this thread also reported no issue with the D300. Noone has reported an issue with the D300. So it's either a problem with the D500/D700 or the AMD driver for the D500/D700. We need to see some tests with Boot Camp.

There's a possibility that the NVIDIA graphics is working better than standards to allow working with a monitor that doesn't meet standards - but that's probably crazy talk and the engineer shouldn't be so lazy trying to track down this problem.

Well I just installed the Yosemite public beta and I am getting 3840x2160 at 60hz as soon as it booted to the desktop and the picture overlap is gone for me as well. The resolution and frequency are confirmed by the monitor information section of the monitor menu.

I have the Samsung U28D590D monitor with and dual D500's nMP.

Looks like progress!

It's definitely progress as I can also confirm that 10.10 fixes the tearing issue. However, I was wondering if anyone else is experiencing the issue of the monitor not receiving a signal when you first turn on the Mac Pro. It's remedied by unplugging the monitor and then plugging it back in, but it's not an ideal solution.

Hi crhendo1,

Are you referring to 6 cores when you say "6 way"? When plugging into the thunderbolt ports you need to keep in mind that there are 6 ports but 3 buses. Try running your monitor off the bottom thunderbolt port on the left hand side of the group of TB ports. Make sure that you have nothing else plugged into the HDMI port or the other bottom thunderbolt port on the right side of the group. This will ensure that enough of the video horsepower is moving through that thunderbolt bus unimpeded. Apple has a technical brief on the thunderbolt bus configurations somewhere on this support forum.

You want to make sure that your monitor cable is a good one as well like joevt says. You can check with Displayport.org on their choice of cables for this application. Is there a setting in your monitor that forces the input to "displayport" or "SST"? My Samsung seems to auto sense the source, however, I am not familiar with your monitor.

Regarding having to unplug the Samsung monitor to get it back after sleeping. This has happened for to me but only in one instance when I put the machine to sleep from the apple menu. Otherwise, if it goes to sleep with the power management settings, it will wake up no problem as well as turning the power switch on.

It seems that Apple has made some improvements concerning the use of 4k monitors. Apple has officially stated that they support a certain list of 4k monitors but these are typically MST (multi stream transport) technology. So the question is: Does the nMP support 4k monitors at 60hz? The answer would be "YES" providing the monitor is on the list of supported MST monitors. Refer to Apple support bulletin ht6008.

As savvy users, we have decided to get much more affordable SST (single stream transport) monitors and then attempt to make them work. Joevt has graciously provided some file content to allow most of us to get close to 50hz @ 4k with our SST monitors. While this is a bit choppy, it is still far better than HDMI 4k @ 30hz. It's funny that when I bought my 4k monitor from Futureshop, the sales guy said that it wouldn't work with my nMP. I just looked at him sideways and thought that he was crazy.

I was very disappointed that my nMP 6core with D500's struggled to drive my Samsung 28" 4k monitor. I was ready to return the nMP. But now, I am enjoying this setup. It took the Yosemite Beta to break the 50hz barrier. Now I am running 4k @ 60hz.

It seems that Apple has decided to invest R&D in making OSX 10.10 work with SST technology while these fixes appear to be missing from OSX 10.9.

Since SST is evolving rapidly, Apple and AMD need some time to catch up and I am happy with my personal results.

Also, the retina scaling options work great and are super clear.

I have attached a picture of my screen taken a few moments ago. It has been this way since I installed the 10.10 Beta.

Yes - Yosemite seemed to fixed the issue on the MacPro with the the D700 card running at 3840x2160@60Hz

The D300 card worked fine at 3840x2160@60Hz in 10.9 and 10.10

Cables I use are:

1m Mini DisplayPort to DisplayPort 1.2 Adapter Cable MDP2DPMM1M

and

CDLMDP-103 - 3m Display Port 1.1 Cable D-Port(m) to Mini-D-Port(M)

Slightly related:

We also have requirements for 6x 1920x1080 DVI outputs

For this we use the following ACTIVE MDP-DVI cable

2m Mini Displayport To Dvi Active Adapter Converter Cable (1920x1080 / 1920x1200) MDP2DVIMM3BS

This is contrary to apple's advice about the total number of DVI outputs possible…!!..

Mac Pro (Late 2013): Using multiple displays - Apple Support

…they only mention passive adaptors - not the active!

S

I have the exact same issues as 60 Hz via a DP 1.2 cable with an Eizo EV3237 - the tearing on the right side of the screen after waking from sleep.

Same problem on two different DP <> MDP 1.2 cables (high bitrate for 4K) - one is a factory cable from Eizo.

Solutions - each one works on its own:

- switch LCD off and on again

- change resolution and change it back

- change dekstop rotation in OS X prefs

RUnning 10.10.1.

I have the Samsung U28D590D connected to my late 2013 MacBook Pro and could only get 3840x2160 @ 30Hz on OSX 10.10.2 through the HDMI port. Connecting up to the Thunderbolt port with would not work. After updating to 10.10.3 I decided to try the display port again and was very surprised and pleased to see that I'm now getting 3840x2160 @ 60Hz! Problem fixed.

The issue is summarized here. We’ll have to wait for Apple/AMD to update drivers or else settle for 30Hz HDMI. Although I’ve noticed that with some tasks that don’t take up the whole screen, I can use 60Hz DisplayPort without noticing the glitch too much.

But it works on Windows 8.1 via Boot Camp just fine (6-core Mac Pro with D500s), as well as on a dedicated Windows PC with a GTX 780Ti. It looks gorgeous; I’ll be quite concerned if Apple can’t get this working on their high-priced workstation.

Hi ttppee, I too had purchased a pair of PB287Qs only to discover the 56Hz and tearing along the right edge problem. I submitted a bug report to Apple and luckily, they have responded asking me to provide some additional data - hopefully it will lead to a solution! Unfortunately, I have since returned the monitors so I cannot provide that data. If you are able to get me these files, I'll gladly submit them and hopefully we can all receive a fix from Apple. Thanks!

This is a courtesy email regarding Bug ID# 17378711.

Please update your report directly at http://bugreport.apple.com for the fastest response. Please do not email your updates.

Engineering has requested the following information in order to further investigate this issue:

Please attach the output of 'sysdiagnose' collected while the problem is occurring or if not possible taken after the issue has occurred. 'sysdiagnose' can be triggered by pressing Cmd-Opt-Ctrl-Shift-Period, and it may take a few minutes to complete. When ready, the output will automatically be revealed in a Finder window (or it can be manually retrieved from /var/tmp)

Also, please include a full System Information Report.

To obtain a full System Information Report on OS X:

1. Select "About This Mac" from the Apple Menu

2. Click the “More Info…” button on the About This Mac window

3. Click “System Report…” on the next About This Mac window

4. Select "Save…" from the File menu (cmd-s)

5. Change the file name and save location as needed

6. Click the "Save" button

A System Information Report can also be obtained via Terminal using the following command:

/usr/sbin/system_profiler -detailLevel full -xml >mymachine.spx

This command will create a full System Information Report, named "mymachine.spx", which will open in System Profiler on another machine.

Please attach the files to your bug report.

Bug reports requiring your attention will appear under ‘My Originated Problems’. Please review this bug report and provide the requested information via the Apple Bug Reporter.

<http://bugreport.apple.com>

Thank you for your assistance in helping us discover and isolate bugs within our products.

Best Regards,

Apple Developer Support

Worldwide Developer Relations

I have a the UD590 and a Mac Pro late 2013 with the D700s. I am seeing this issue as native resolution as well. It also doesn't turn on after sleep sometimes and I recently caught it blinking in and out like crazy. The blinking and not waking up requires a power cycle to fix. Early adopter for life!

That said, there are a number of D700 GPU issues introduced with 10.9.2 and 10.9.3. There is a new 10.9.4 beta release that clears up the multi monitor issue with the Mac Pro. Could be worth a shot to try the 13E19 beta. I don't want to sign up for a $99/year plan just to test it though. 😝

Oh wow! It works!!! 😀 Thanks so much joevt! (and everyone else that has helped!)

Before trying the custom EDID that you created, I tried using SwitchResX to create custom native resolutions (3840x2160) at refresh rates above 50 Hz. The highest I could get without causing the tearing on the right side of the screen was 54 Hz. Here is the screenshot of the settings at 54 Hz:

Because I couldn't reach 56 Hz at the native resolution, I did not try to apply your custom override file with the preferred timing set to 56 Hz. However, I did try the 50 Hz version, and it works magnificently 🙂

Firstly, I reset to factory default settings in SwitchResX, then restarted the computer.

/System/Library/Displays/Overrides/DisplayVendorID-4c2d/ was empty after I restarted, so I created a file called "DisplayProductID-b80" and pasted in the 50 Hz version of your override code. After a quick reboot, all of the resolutions were available at 50 Hz, including the scaled HiDPI ones!

You're an absolute champion, joevt. If it's not too much trouble, do you think you could create an override file with a preferred timing of 54 Hz? I don't really know if I'd notice the difference between 50 and 54 Hz, but I assume that faster is better 🙂 (all good if you can't be bothered, I'm very happy already!)

Thanks again, I hope everyone else can recreate the same success with their shiny new 4K monitors!

Poyda