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LG Ultrasharp 4k lag

Fireball Dragon

Fireball Dragon

macrumors 6502a
Original poster
Nov 26, 2012
880
256
Chigwell, England
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.
 
Frosties said:
  • MacBook 2015 is the one you use
  • What display setting do you use - 30Hz?
Click to expand...

That's right. 2015 MacBook (Intel Core M 1.2 GHz).

I am not sure if I am using 30 or 60Hz.
[doublepost=1479927593][/doublepost]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).
 
'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.
 
modernaccord said:
'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.
Click to expand...

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.
 
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"
 
neil218 said:
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"
Click to expand...

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
 
modernaccord said:
'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.
Click to expand...

That monitor is $649.99. Fffffffffffffffff
 
Fireball Dragon said:
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
Click to expand...
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.
 
Fireball Dragon said:
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.
Click to expand...

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.
 
kwandrews said:
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.
Click to expand...

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.
[doublepost=1479979487][/doublepost]
 
kwandrews said:
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.
Click to expand...
The 2016 15" MBP can certainly power either of the LG displays.
 
Fireball Dragon said:
Do you mean that the LG display can power the 15" MBP?
Click to expand...

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.
 
BeatCrazy said:
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.
Click to expand...
BeatCrazy said:
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.
Click to expand...

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.
 
I think the 4K one can certainly power the 15'' MBP. But it will be slower with only 60W.
 
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.
 
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Brookzy said:
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.
Click to expand...

Yep, all correct above!
 
BeatCrazy said:
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.
Click to expand...

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.
[doublepost=1480055929][/doublepost]
  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.
Click to expand...
  1. Correct. Supplement with the charger that came with the 15".
  2. Yes, I can confirm. My 12" ran it at 60Hz
  3. Correct
 
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Reactions: Brookzy
kwandrews said:
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.
[doublepost=1480055929][/doublepost]
  1. Correct. Supplement with the charger that came with the 15".
Click to expand...
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.
 
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.
 
kwandrews said:
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.
Click to expand...
USB-C (DisplayPort 1.2 Alt Mode) doesn't support 4K@60Hz and data transfer at USB 3 speed simultaneously.
 
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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?
 
For all those having a lag in external 4K displays. The following has solved my problems:

1) In your TV / monitor select Game MODE
2) In my case Mac Pro 2013. MiniDisplay Port to HDMI2 ACTIVE Adaptor. It must be an active adaptor!
3) HDMI2 cable ( check that it works at 60hz ) conected from the Adaptor to your TV / Monitor HDMI input
4) Get the APP SWITCHRESX and select one resolution with 60hz. I have 1080p60 NTCS.

NOW finally there is no mouse lag!!!
 
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