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LG UltraFine 5K monitor - external devices not detected

Hi,

Few days ago I finally received my new LG UltraFine 5K display. I also purchased the new MacBook Pro (15 inch) with GPU upgrade, i7 upgrade and 1TB flash storage.

Connecting the LG display to the MacBook is working fine. However when I disconnect the LG display by unplugging the USB-C cable and subsequently reconnect the USB-C cable in the MacBook, the external devices in the other USB-C ports of the LG monitor are not detected.

I have a USB-C to USB adapter with a lightning cable for my iPhone plugged in & a Belkin USB-C to Ethernet adapter connected to my router. These two cables are not detected after unplugging and reconnecting the MacBook with the display.

I need to unplug both cables on the back of the display and plug them back in in order to have the monitor detect them.

Is this a known issue?

Posted on Dec 29, 2016 6:35 AM

40 replies

ardias

Level 1

11 points

Aug 4, 2017 11:28 AM in response to JoelCraenhals

I think that this issue was resolved by LG on 7-13-2017 with a software update. Just install LG Screen Manager and proceed to update the monitor. Link HERE.

Aug 8, 2017 10:54 AM in response to ardias

^ the latest LG software update fixed this for me.

logicito

Level 1

46 points

Aug 16, 2017 12:51 PM in response to defractor

What is the purpose of the Split Screen functionality? is it kind of hardware split screen? I can have 2 windows side by side

macsmb

Level 1

4 points

Nov 21, 2017 8:53 AM in response to JoelCraenhals

Why is this thread still marked solved?

This issue still exists.

macsmb

Level 1

4 points

Dec 1, 2017 7:05 AM in response to JoelCraenhals

I opened a bug report with the Bug ID 35658244.

Please open a report with apple and reference this ID..the more people the more likely they fix.

Dec 6, 2017 10:41 AM in response to macsmb

also having this problem

macsmb

Level 1

4 points

Dec 6, 2017 11:31 AM in response to andrew54941

open a bug report with apple and post the bug id for reference.

macsmb

Level 1

4 points

Dec 6, 2017 1:20 PM in response to andrew54941

firmware version?changelog?

you might want to wait a couple days/weeks..might be premature.

macsmb

Level 1

4 points

Dec 6, 2017 1:31 PM in response to macsmb

the latest firmware is 3.04,1.13,5237,3.04,0.1e

been running that since july..it was meant to fix a volume bug. nothing to do with usb.

Dec 11, 2017 11:32 AM in response to macsmb

I don't know but its working fine still for me after the update... maybe reseting the monitor could do the trick. I also updated to macOS 10.13.2 around the same time.

LG UltraFine 5K monitor - external devices not detected