CATALINA IOS UPDATE WILL NOT RECOGNIZE MY LG MONITOR/TV

[alb.matteucci]

MY MACBOOK PRO, EARLY 2015, WITH CATALINA IOS UPDATE, WILL NOT RECOGNIZE MY LG MONITOR/TV. In Systems Preferences, then Displays, when the "Show mirroring options in the menu bar when available" is checked, Catalina does not recognize the HDMI connection to my LG TV. Am I doing something wrong or is this a problem with Catalina?'

Thanks in advance.

 

[coco641]

HI, I'm having the same issue with my LG 29wk600, it is wrongly recognized as a LG HDR WFHD, the image options are not the same anymore.
Thank if someone can help !

 

[tommiy]

I've been battling this since the first release of Catalina. External monitors it does not like. I can convince 10.15.1 to pick the right monitor for my LG 27UK850 only at the initial connection time. Anytime after that it does not see he correct device in the MAC. I've tried adding HDMI switches in between etc to see if I could turn the power off to the switch would enable the MAC to see the correct device again and that does not assist. I've provided feedback to Apple at the first release and posted in Apple Communities. There are other with the same issue. I genuinely find the only way I get the MAC to detect properly is unplug the monitor, wait until the messages on the LG disappear and plug back in before the LG completely goes to sleep. It is hot and miss.

Due to all the problems with running an external monitor on a MAC I simply have not upgraded past 10.15.1. All the above may no longer be applicable in anything above 10.15.1 as it appears each minor release is breaking some thing more on the MAC. 10.15.1 does have other external monitor issues that I have learnt to deal with in manual work around modes. At least I know I can.

I wish you luck. Please let me know how you go at some point i need to pick the OS that will remain on this MAC for the rest of its life.
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I just noticed this thread on here thats been updated for Catalina and still works to fix monitor EDID data. Going to have to try myself today to see if this works as good as the feedback. Best of luck cross the fingers.

 

[mogly]

Although late, but I have to share this, as I was suffering from this issue very long! All started somewhen after Catalina update. As I did not use the monitor a lot until Covid Home Office started last year in March, this was not a priority to fix. But in home office this became a real issue. So I spent nights on the topic. LG Support blamed Apple and Apple did not respond. I had a MacBook Pro from 2015 and a MacBook Pro from 2018. Both having the issue the LG 27UK850-W being recognized as LG ultrawide. Eventually after googling around I found a solution working somehow for me.

I purchases SwitchResX and was able to set custom resolutions. Even scaled HDPi solutions were working and this was find UNTIL....

I purchased a MacBook Air 2020 with M1 chip and Big Sur installed. I was thrilled with the new machine BUT.... The LG suffered again from the same issue. Detected as LG Ultrawide. I thought, hey, no issue, I solved that problem on 2 macs using SwitchResX, so lets do it a 3rd time. But suddenly, on the M1 somehow SwitchResX does not allow custom resolutions anymore.... Damn... :-(

So again I spend hours in the net, googling on how to overwrite EDID on Big Sur and so on... But then I accidentally found a article explaining on how on the LG to enter the service menu. So I gave it a try. On a first glance not much success, I just switched on and off all settings and restarted the monitor. AND the aspect ration of the monitor showing properly again, monitor reported as LG 4K HDR!? How? I did actually not change a single setting. I just changed and changed them back. So if anybody wants to try the same do:

1. ) Switch Off Monitor
2.) On the Joystick press LEFT, LEFT, LEFT, RIGHT
3.) Switch On the monitor by pressing on the joystick
4.) Go to Settings.

If it worked the menu should be somehow on top left (see attached images)
I then did the following

1.) Select ToolOptions -> Joystick RIGHT
2.) Select ToolOption 1 -> Joystick RIGHT
3.) Select Output Type -> Joystick RIGHT choose VByOne Press Joystick
4.) Again Select ToolOption 1 -> Joystick RIGHT
5.) Select Output Type -> Joystick RIGHT until it is again eDP
6.) Press Joystick and then Joystick LEFT -> menu should quite
7.) Switch off monitor

Dring a coffee ( I actually made a break, because it did not immediately show anything)

8.) Switch on monitor and connect your Mac. Done

In my case it fixed it. I'm not 100% sure which other options I toggled on and off during the procedure before. But some of it must have triggered somehow a kind of RESET. At least now my new MacBook Air and also the MacBook Pro 2018 show the Monitor as LG 4K HDR with proper resolutions, even HDPI. So I hope this helps someone with the same trouble.