LG Ultrasharp 4k lag

Discussion in 'MacBook' started by Fireball Dragon, Nov 23, 2016.

  1. Fireball Dragon macrumors 6502a

    Fireball Dragon

    Joined:
    Nov 26, 2012
    Location:
    Chigwell, England
    #1
    I received my LG Ultrasharp 4k display today. Absolutely gorgeous!

    I am using it with my 12" MacBook, but have noticed some lag. Has anyone else got this, and any fixes?

    I am also using a Logitech k810 keyboard, and notice that when I adjust the display brightness with it, there is a delay before it registers on the display.
     
  2. Frosties, Nov 23, 2016
    Last edited: Nov 23, 2016

    Frosties macrumors 6502a

    Frosties

    Joined:
    Jun 12, 2009
    Location:
    Sweden
    #2
    • MacBook 2015 is the one you use
    • What display setting do you use - 30Hz?
     
  3. Fireball Dragon thread starter macrumors 6502a

    Fireball Dragon

    Joined:
    Nov 26, 2012
    Location:
    Chigwell, England
    #3
    That's right. 2015 MacBook (Intel Core M 1.2 GHz).

    I am not sure if I am using 30 or 60Hz.
    --- Post Merged, Nov 23, 2016 ---
    Another issue i am having is that my speakers (Bowers and Wilkins MM-1) won't work when I connect them to the back of the monitor via USB-C (with an adapter).
     
  4. modernaccord macrumors 6502a

    Joined:
    Apr 20, 2015
    Location:
    Seattle, WA region
    #4
    '15 Macbooks can't run 60Hz unless you do the hack one of the major mac blogs posted. I just got the far cheaper LG 27UD68 ($350) and need to do the hack to get the refresh rate to 60Hz. 30Hz is a bit laggy like you describe.
     
  5. Fireball Dragon thread starter macrumors 6502a

    Fireball Dragon

    Joined:
    Nov 26, 2012
    Location:
    Chigwell, England
    #5
    I ama little confused. This is supposed to be the new (almost) official Apple monitor, and it doesn't even do 60Hz!? :eek:

    I was thinking that once I get my new MBP the lag will disappear, as this is just because the 12" MacBook is struggling to drive all those pixels.
     
  6. neil218 macrumors newbie

    Joined:
    Nov 15, 2016
    #6
    Some users reported that their 2015 MB runs this display at 48Hz (4096x2304). In fact, the 2015 MB can run 3840x2160 at 60Hz.
    You can check the refresh rate in "About This Mac -> System Report... -> Graphics/Displays"
     
  7. Fireball Dragon thread starter macrumors 6502a

    Fireball Dragon

    Joined:
    Nov 26, 2012
    Location:
    Chigwell, England
    #7
    Thanks, mate.

    Unfortunately, cannot see it there. This is all I get (I am not connected to the monitor right now, so not sure if that is why?)

    Intel HD Graphics 5300:



    Chipset Model: Intel HD Graphics 5300

    Type: GPU

    Bus: Built-In

    VRAM (Dynamic, Max): 1536 MB

    Vendor: Intel (0x8086)

    Device ID: 0x161e

    Revision ID: 0x0009

    Metal: Supported

    Displays:

    Color LCD:

    Display Type: Retina LCD

    Resolution: 2304 x 1440 Retina

    Retina: Yes

    Pixel Depth: 32-Bit Color (ARGB8888)

    Main Display: Yes

    Mirror: Off

    Online: Yes

    Automatically Adjust Brightness: Yes

    Built-In: Yes
     
  8. macmee Suspended

    macmee

    Joined:
    Dec 13, 2008
    Location:
    Canada
    #8
    That monitor is $649.99. Fffffffffffffffff
     
  9. neil218 macrumors newbie

    Joined:
    Nov 15, 2016
    #9
    I am sorry. Normally it's where we check the fresh rate, maybe this official display is a bit special. I have learnt a new thing.
     
  10. kwandrews macrumors 6502

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    Mar 7, 2012
    Location:
    Colorado, USA
    #10
    I had the 4k LG and returned it, but not related to performance with the 12" (2016 m5). I switched to the 15" MBP and it won't power it...only the 12 & 13".

    LAG: Yes. it's not your keyboard. It happens with the controls on the MB's keyboard too. It happened with both the 12 & 13" (2016's) the same. Volume and / or brightness was a noticeable lag. Annoying.
     
  11. Fireball Dragon thread starter macrumors 6502a

    Fireball Dragon

    Joined:
    Nov 26, 2012
    Location:
    Chigwell, England
    #11
    Thanks for your input! I'm really surprised to learn that it didn't power the 15"!! Mine isn't coming until late December, it I have the monitor now.

    As Apple's return policy should still be in place once I get my MacBook, I guess I'm covered, so will check once it comes.

    Has anyone else had any issues with the LG 4K not being able to power the 15"? Maybe it canonot power the previous gen? I'm pretty sure I've seen YouTube videos of the LG 4K powering the 2016 15" MBP.
    --- Post Merged, Nov 24, 2016 ---
     
  12. BeatCrazy macrumors 65816

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    Jul 20, 2011
    #12
    The 2016 15" MBP can certainly power either of the LG displays.
     
  13. Fireball Dragon thread starter macrumors 6502a

    Fireball Dragon

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    Nov 26, 2012
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    Chigwell, England
    #13
    Do you mean that the LG display can power the 15" MBP?
     
  14. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #14
    Yeah, I think we had a confusion of words. The monitor of course won't power the 15", but the 15" can "drive" (power was a poor choice of words) the monitor.

    Apologies for any confusion.
     
  15. Fireball Dragon thread starter macrumors 6502a

    Fireball Dragon

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    Nov 26, 2012
    Location:
    Chigwell, England
    #15
    Hey, no worries at all. Just wanted to make sure we were on the same page lol

    I actually managed to find my 15" MBP in-store today!! So will post back with how it works with the LG 4K.

    I am expecting the monitor to be able to charge, albeit slower than the 5k. Not an issue tbh.
     
  16. neil218 macrumors newbie

    Joined:
    Nov 15, 2016
    #16
    I think the 4K one can certainly power the 15'' MBP. But it will be slower with only 60W.
     
  17. Brookzy macrumors 68040

    Brookzy

    Joined:
    May 30, 2010
    Location:
    UK
    #17
    Lots of misinformation in this thread:
    1. The LG UltraFine will power any late 2016 MacBook Pro at up to 60W. It just won't charge the 15" model at full speed as that would require 87W.
    2. The 12" MacBooks - both 2015 and 2016 - do support 60Hz on some displays without any hacking since macOS Sierra. The LG UltraFine 4K is one of them.
    3. To check the refresh rate of the external display, it must be connected when you are looking in System Information.
     
  18. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #18
    Yep, all correct above!
     
  19. kwandrews macrumors 6502

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    Mar 7, 2012
    Location:
    Colorado, USA
    #19
    Yes, the LG only supplies 60'ish power (which can charge the 12 or 13") but the 15" requires 87w. The 27" LG provides enough power to charge the 15". Yes, the 15" can connect to and run the 21.4" 4k LG, but you'll need use the usual power cable to keep your battery from draining.
    --- Post Merged, Nov 24, 2016 ---
    1. Correct. Supplement with the charger that came with the 15".
    2. Yes, I can confirm. My 12" ran it at 60Hz
    3. Correct
     
  20. Fireball Dragon thread starter macrumors 6502a

    Fireball Dragon

    Joined:
    Nov 26, 2012
    Location:
    Chigwell, England
    #20
    Not true. I am using the 4K display with my new 15" and it is connected with a single cable. Charging through the monitor is fine. I wasn't checking how quick it was, but was up to 100% pretty soon.
     
  21. kwandrews macrumors 6502

    Joined:
    Mar 7, 2012
    Location:
    Colorado, USA
    #21
    It will charge, just VERY slow.....mine never progressed more than 1-2% in an hour. On top of that, it was crippled with the USB 2.0, so not much use with the USB-C ports for any sort use other than a keyboard (but most are wireless anyway). I'll hold out for the 5k to make a decent hub out of it with some good speed. Why they used USB 2.0, I just don't get it.
     
  22. neil218 macrumors newbie

    Joined:
    Nov 15, 2016
    #22
    USB-C (DisplayPort 1.2 Alt Mode) doesn't support 4K@60Hz and data transfer at USB 3 speed simultaneously.
     
  23. j.quintana macrumors member

    Joined:
    Oct 2, 2015
    #23
    I ordered a 2016 MacBook yesterday and I thought the Ultrasharp 4k would be a good way to use the MacBook while I'm at my desk.

    However, threads like this get me thinking: Is it really not possible to run the full resolution of the Ultrasharp 4k display (not just 3840 * 2160) @60Hz without any lag of the mouse and keyboard? I want to use the Magic Keyboard 2, Magic Mouse 2 and Magic Trackpad 2 as input devices.

    Is it better with a 3840 * 2160 pixel display and an USB-C hub that supports HDMI 2.0 for 60 Hz or is that laggy, too?
     

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