Mac Pro Late 2013 and Samsung 4k monitor problem

If SwitchResX says "modified" in the bottom right corner or the new timing says "Not saved" then press Command-S to save. Type in your password to save. Then if the new timing says "Needs to reboot" then you need to restart the Mac. After restarting, if the driver accepts the resolution/timing then it will say "Active", otherwise it will say "Not activated - invalid?".

Did the 2560 x 1440 timing not get activated? In the Current Resolutions tab, you can click a radio button for an activated resolution to use it, and you can double click it to see the timing information for it.

Laseyman, that's pretty much it! The filename for the override must be "DisplayProductID-b80" (no quotes, no extension). I haven't tried joevt's updated codes yet (with the corrected blanking value), but I've been using his earlier 50 Hz one for many hours without any problem. I will try the newer ones later and see how high I can get the refresh rate.

EDIT: I'm not even using SwitchResX now. Just using the Displays preference pane in system preferences. It does work in SwitchResX though.

Poyda wrote:

You need a good Mini DisplayPort to DisplayPort 1.2 cable AND you need to use the custom EDID / timings that have been discussed from page 6 onwards in this thread.

Thanks for confirming that as I saw the responses about cables and got excited 😉

Alas you still need to ***** around like you're on Linux or some such OS. 😉

It seems that this isn't even solved in Yosemite Beta.

<Edited by Host>

I purchased a NEC Multisync EA244UHD IPS display and having the distortion issues with the right side of the screen with Display Port 1.2 at 60hz at any resolution however no issue with Display Port 1.1 at 30hz. I took my mac pro 10.9.4 with dual D700's into the Apple store and my NEC monitor and they hooked up the monitor to a MacPro with D300's and it worked fine with Display Port 1.2 and 60Hz at any resolution. The monitor also woke up fine with shutting down or sleeping which is the other problem I have. I have to jump through hoops to get the MacPro to wake up the NEC monitor even running Display Port 1.1. It seems that the issue is with my D700's.

Hi Nancy, I can't say that I have had the same flickering on my screen. It has been pretty stable.

I just had a problem with waking it up once when I put the mac pro to sleep. Now I just use the energy settings and let it go to sleep that way. and it wakes up with a mouse click.

Have you plugged another Thunderbolt device into the same bus? Have a look at the bus configuration for the mac pro. If you are hanging another device on the same bus, it could be interfering with the 4k SST output.

If you haven't seen the TB bus layout, search the Apple support site for the tech bulletin.

Hope that helps.

Yes, as long as you have a 2013 Mac Pro with the lowest quality video cards (D300s) and a mini-diplayport to display port 1.2 adapter for each monitor, you can drive at least two (and if you believe Apple's claims 3).

If you have either of the two better video cards (D500s or D700s), you can display at 60hz as well, but Apple has totally failed to produce a functional driver that won't produce the "tearing effect" on the right side of 4k monitors.

Just to update everyone, I took my Mac Pro to the Genius Bar today. The Genius took a look at it, and ran some hardware tests, and everything came back fine. He also tried hooking up an Apple Thunderbolt Display, and another display with a VGA to display port adapter. Those worked fine. So, it looks like only these 4k monitors and the LG 34UM95 have the boot screen problem. He told me there's nothing else they can do, and according to internal documentation, engineering isn't even looking into the problem.

I'm not alone in this issue, as anyone who doesn't see the Apple boot splash when booting/rebooting is having this issue. For people like me who use FileVault, or want to use bootcamp/choose a boot drive cannot with these displays. Using another display, or using HDMI is not a solution to this issue, as these monitors should just work fine.

Never have I ever had an issue with a monitor on any other computer I've owned. This is extremely frustrating, and disappointing for such an expensive and "Pro" marketed system. And for engineering to do nothing about this issue is unacceptable, as in all honesty it appears to be a widespread issue. However, it also appears people don't contact Apple about this, and just live with it. Some can I suppose, but others like me really can't.

We need people who don't get the Apple boot splash with these monitors to call Apple and let them know about this issue, it's the only way to get engineering to fix this issue, and add support for more 4k displays.

good hint SNP001 to test 10.10 on an external drive .... and I can confirm too: the "artifacts and flickering" on the right side of my Eizo screen are gone!

now the dilemma starts ... artifacts or poor design?! 😉

other problem I got with Boot Camp that the monitor runs in 800x600'ish resolution but shows full ... but that doesn't belong here.

а редактировать инфо о мониторе пробовали

/System/Library/Displays/4c2d/ - b80

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

<key>DisplayProductID</key>

<integer>2944</integer>

<key>DisplayVendorID</key>

<integer>19501</integer>

<key>DisplayProductName</key>

<string>SAMSUNG UHD</string>

<key>IOGFlags</key>

<integer>65536</integer>

<key>dmdg</key>

<data>

AAAAAg==

</data>

<key>scale-resolutions</key>

<array>

<integer>32768800</integer>

<integer>67110144</integer>

</array>

</dict>

New 10.9.3 Beta is out! Maybe that will solve the compatibility issue with Samsung 4k monitor.

http://www.macrumors.com/2014/04/29/mavericks-1093-build13d55/

The new cable did indeed fix the problem. Hooray!

This article notes that to use the two mentioned displays at 60Hz, one must re-set the DISPLAY's internal settings:

Using 4K displays and TVs with Mac computers

.

Perhaps the Samsung display has a similar setting and would respond in a similar way ?

Offical Mac OS 10.9.3 has been released. Let's hope that will solve Samsung and Asus 28 inch 4k 60Hz problem .

I have upgraded it already and works well with my Macbook pro + Dell UP2414Q setup.

Good Luck.

I have tested this monitor on a MacPro with the AMD FirePro D500 with the Samsung U28D590 4K monitor, and as far as I can see, with the 10.9.3 update it made the issue worse. Tearing area as reported by other users here is bigger, and I cannot get a feedback on what Hz or resolution is actually being displayed. Very disappointing. Tried with MacBook Pro Retina with the NVIDIA GT650M and it can only do 2560x1440. Scaling is rather awful.

Yeah, definite mouse lag is visible at 30Hz, although I suppose if you use it long enough you'll get used to it. Personally, I moved the U28D590 to my Windows 8 system (where it works and looks great) and went back to the Thunderbolt Display on the Mac Pro until (if?) Apple can fix the AMD DisplayPort drivers (and it's definitely an AMD/OSX thing because those with NVIDIA GPUs in the Retina MacBook Pro are getting perfect 60Hz DisplayPort output).