Spakuloid

Q: LG 31MU97 4K Display not showing 4K on MacPro

Hey there - I just bought the LG 31 MU97 4K Display and the best resolution I can get out of it is 3840 x 2160. Wondering if there needs to be a service update of something similar in order to get the full 4K on the new 2013 MacPro - thanks.

Mac Pro (Late 2013), OS X Mavericks (10.9.1), 6 Core

Posted on Nov 3, 2014 2:18 PM

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Q: LG 31MU97 4K Display not showing 4K on MacPro

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  • by macreal,

    macreal macreal Dec 17, 2014 1:18 AM in response to redon77
    Level 1 (15 points)
    Dec 17, 2014 1:18 AM in response to redon77

    Thanks for confirm...

    anyway, i can't set 4096 yet. can't sure what's wrong with my product.

  • by kgelner,Apple recommended

    kgelner kgelner Dec 24, 2014 1:54 PM in response to Spakuloid
    Level 4 (1,205 points)
    Dec 24, 2014 1:54 PM in response to Spakuloid

    Just to add to this discussion, with a late 2013 Retina Macbook Pro running 10.10.1 & an NVIDIA GT750M video card, I am able to go to 4096x2160/50Hz if I hold down the Option(Alt) key  and click on Scaled in Display Preferences:

     

    Screen Shot 2014-12-24 at 2.31.22 PM.png

     

    Otherwise 3840x2160 is the max resolution visible.

     

    The monitor quality is very nice, but it seems awfully wide at first use... hopefully I'll get used to it.  I'm a little concerned because I'm starting to see a bit of flickering off to one side of the display (like a quick twitch but only half the screen).

  • by skunk33,

    skunk33 skunk33 Jan 8, 2015 7:42 PM in response to Spakuloid
    Level 1 (0 points)
    Jan 8, 2015 7:42 PM in response to Spakuloid

    Just got this monitor setup on a mid 2014 15' Retina MBP using the display port cable that came with the monitor. Did a test at http://www.testufo.com/#test=framerates and show 50hz

  • by kgelner,

    kgelner kgelner Jan 8, 2015 7:49 PM in response to kgelner
    Level 4 (1,205 points)
    Jan 8, 2015 7:49 PM in response to kgelner

    Quick followup to my first message - the flickering was all due to a third-party DisplayPort cable I had bought because I thought the cable included with the monitor would not drive the full resolution - in fact the original cable has been just fine, with zero flickering.  Still the full resolution at 50Hz.

  • by skunk33,

    skunk33 skunk33 Jan 9, 2015 11:42 AM in response to skunk33
    Level 1 (0 points)
    Jan 9, 2015 11:42 AM in response to skunk33

    OK- scratch that! I just rebooted the computer for the first time after having it on for 12 hours and I can longer go over 3840x2160 30hz. It was working at 4096 out of the box. Not sure what happened. Anyone else experience this?

  • by skunk33,

    skunk33 skunk33 Jan 9, 2015 12:02 PM in response to skunk33
    Level 1 (0 points)
    Jan 9, 2015 12:02 PM in response to skunk33

    http://forums.macrumors.com/showthread.php?t=1811376&page=15 post #366 seems to highlight the issue i have.

  • by ianim8,

    ianim8 ianim8 Mar 24, 2015 5:54 PM in response to skunk33
    Level 1 (0 points)
    Mar 24, 2015 5:54 PM in response to skunk33

    I havent tried this display with Yosimete but Im hoping the OS update will get rid of this:

    LG31MU97_zps7pv5eliy.JPG

    This is caused by the 60Hz setting (SwithResX as well).

  • by Grant Bennet-Alder,

    Grant Bennet-Alder Grant Bennet-Alder Mar 24, 2015 6:32 PM in response to ianim8
    Level 9 (60,904 points)
    Desktops
    Mar 24, 2015 6:32 PM in response to ianim8

    HDMI is limited to 30Hz.

     

    If you can, connect directly with a DisplayPort family cable, as no conversion is needed and data rates and refresh rates supported are much higher.

  • by ianim8,

    ianim8 ianim8 Mar 25, 2015 8:31 AM in response to Grant Bennet-Alder
    Level 1 (0 points)
    Mar 25, 2015 8:31 AM in response to Grant Bennet-Alder

    Yes that I know.
    Fixed it for now with Yosemite upgrade.
    However this display is for Avid and Pro Tools studio so hoping updates on both apps soon.

  • by cyclomedusa,

    cyclomedusa cyclomedusa Apr 17, 2015 2:25 PM in response to ianim8
    Level 1 (0 points)
    Apr 17, 2015 2:25 PM in response to ianim8

    Visual glitches: I have that and more!...

     

    4096x2160@ 60Hz SST is now official / supported: great!? No!

    With yosemite 10.10.2 it was working fine at 50Hz, now with 10.10.3, 60 Hz is forced: the result is visual glitches and (more annoying) everything turning to black most of the time!

    With alt+scaled+show lower resolution: 50Hz could be selected (when the screen is not black! ;-) but only for max resolution; scaled resolutions are 60Hz only! (why!?)... Also when booting it's in 60Hz: unusable.

    I probably either have a bad graphic card (Mac Pro D300), a bad (LG supplied) thunderbolt-display port cable, or a bad monitor unit (bought in Switzerland where power is at 50Hz btw); but it's too bad that we don't have an easy way to throttle down the refresh rate!

    'waiting for a new cable, meanwhile I've turned off display-port 1.2 on the monitor itself (so is 1.1): I can use the screen in 3860x2160 (scaled "as" 3008x1692) at 30Hz! without too much mouse lag!

    Is there a way to use the EDID?, "driver"? from 10.10.2 instead? I don't want to revert my whole OS to 10.10.2, if it doesn't work with a better cable I'm gonna trash this monitor.

  • by cyclomedusa,

    cyclomedusa cyclomedusa Apr 24, 2015 6:57 AM in response to cyclomedusa
    Level 1 (0 points)
    Apr 24, 2015 6:57 AM in response to cyclomedusa

    (with a new mini DP to DP cable, it's not better)

     

    I reverted to OS-X 10.10.2 (recovery a from a Time Machine backup), all is fine again: 4096x2160 @ 50Hz !

     

    So, I'm stuck with 10.10.2!

    It seem that I'm the only person in the world that want 50Hz instead of 60Hz! (frankly it's probably impossible to tell the difference) but having the choice would be nice: if your particular monitor unit doesn't work well at 60Hz (btw in the user manual the specified default preset is 4096x2160 @ 50Hz). Obviously my monitor / cable failure is not Apple fault but it's annoying to send for repair or trash a monitor that works fine in a mode that suits you! So it's really annoying that there is no way to force / throttle down from 60Hz to 4096x2160 @50Hz (in DP 1.2, when booting or for scaled modes) on 10.10.3...

  • by Daniel_Collin1337,

    Daniel_Collin1337 Daniel_Collin1337 Jun 17, 2015 3:41 AM in response to cyclomedusa
    Level 1 (0 points)
    Jun 17, 2015 3:41 AM in response to cyclomedusa

    Hi,

     

    I'm thinking about buying this monitor and I wonder if the latest version of the OS can run this screen (without visual glitches) at 4096x2160 @ 60 Hz. After reading the whole thread I'm not fully sure that it's fully working yet or not.

     

    I got a Mac Pro (late 2013)

     

    Cheers!

  • by lllaass,

    lllaass lllaass Jun 17, 2015 9:10 AM in response to Daniel_Collin1337
    Level 10 (188,724 points)
    Desktops
    Jun 17, 2015 9:10 AM in response to Daniel_Collin1337

    Have you read this? It has been updated since this discussion was started

    Using 4K displays and Ultra HD TVs with your Mac - Apple Support

  • by Daniel_Collin1337,

    Daniel_Collin1337 Daniel_Collin1337 Jun 17, 2015 12:06 PM in response to lllaass
    Level 1 (0 points)
    Jun 17, 2015 12:06 PM in response to lllaass

    Hi,

     

    Thanks for the reply. That page state that

     

    "With OS X Yosemite v10.10.3, most single-stream 4K (4096x2160) displays are supported at 60Hz operation on the following Mac computers..."

     

    It states "most single-stream" and I just wonder if the LG 31MU97 is one of them?

     

    Cheers!

  • by cyclomedusa,

    cyclomedusa cyclomedusa Oct 6, 2015 7:47 AM in response to Daniel_Collin1337
    Level 1 (0 points)
    Oct 6, 2015 7:47 AM in response to Daniel_Collin1337

    yes the LG 31MU97-B is supposed to work a 4096x2160 @ 60Hz on OS-X, BUT some/many? have problems/defects like mine (was working fine at 50Hz but not at 60Hz, enforced after upgrading to any OS-X version greater than 10.10.2). p.s. maybe that's why LG now lists a 31MU97-Z ?

     

    In the end I send it for repair (p.s. in Switzerland, LG service/repair is not directly handled by LG but "outsourced" to a small company named Repag), they changed the "main-board" and now it's working flawlessly (so far! 'received it few hours ago!) under OS-X 10.11 "El Capitan".

     

    So, as long as your cable is decent (I'm using an Accell mini-DP to DP cable, but the included one should be fine), on a (clean) OS-X >10.10.2 install, at 4096x2160 @ 60Hz if the screen is turning to black, or showing artifacts: it is likely "faulty": have it fixed

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