MacOS showing external monitor's size (inch) wrong.

Question

Level 1

8 points

MacOS showing external monitor's size (inch) wrong.

Computer:

MacBook Pro (16-inch, 2019), 2.6 GHz 6-Core Intel Core i7, 16GB of RAM, GPU-AMD Radeon Pro 5300M, Intel UHD Graphics 630.

---

External Monitor:

LG 27UP850-w, 27 inch, 4K Monitor

---

Problem:

When I go to the "Display" in "About This Mac", MacOS is showing my external monitor as a 31,5 inch monitor (screenshot attached). Because of this issue the only way I can see texts and small details clear is to set the resolution to 1920x1080, other higher resolutions in "Scaled" settings and the "Default for Display" settings makes text and small details blurry/fuzzy.

---

Question:

Is this a MacOS issue or could it be the monitor manufacturer's issue?

Does anyone having this issue?

What can I do to use my external monitor the way it should be?

Screenshot of MacOS showing incorrect size:

MacBook Pro 16″, macOS 11.5

Posted on Aug 16, 2021 7:24 AM

Reply

Answer 1

Best reply

ivan54

Level 4

2,844 points

Aug 16, 2021 8:44 AM in response to thebanduu

Howdy,

I do not have the LG 27UP850-w, 27 inch, 4K Monitor, but there are a couple things I would try if I did.

See if changing the Monitor's Aspect Ratio setting to Original or Just Scan changes things. Normally the Mac senses the display capabilities and offers the correct options. If those are not reported correctly by the display, odd things can happen.

( Manual available at https://www.lg.com/us/support/manuals-documents?csSalesCode=27UP850-W.AUS )

2. Download the display drivers and software to see if they help.

https://www.lg.com/us/support/software-firmware-drivers?csSalesCode=27UP850-W.AUS

Also there's Monitor - Connecting to a Mac

ivan

Reply

Answer 2

ivan54

Level 4

2,844 points

Aug 17, 2021 5:42 AM in response to thebanduu

Hi,

Then the next step would be to ask LG.

https://lgcommunity.us.com

It says you can message them on Facebook or Twitter or check out their YouTube videos.

Search YouTube for "27UP850-w Mac" to see if someone has your setup (or similar).

Let us know how it goes. That sounds like a good display. (I have a MacBook Pro (16-inch, 2019) as well :-)

ivan

Reply

Answer 3

thebanduu Author

Level 1

8 points

Aug 17, 2021 8:01 PM in response to ivan54

Yeah, I contacted with LG care and not much of a luck.

Found a guy on youtube who unboxed 27UP850-w and connected it to his MBA M1. Asked him if he is having this issue and he said YES. Here is his video: https://www.youtube.com/watch?v=4TWAeMLrWEs

I guess it is MacOS issue cause I found several posts about having issues with external monitors here in the forum. :(

Reply

Answer 4

thebanduu Author

Level 1

8 points

Aug 17, 2021 12:15 AM in response to ivan54

Thank you Ivan,

Tried them all as you suggested but the incorrect monitor size still exists. :(

Reply

MacOS showing external monitor's size (inch) wrong.

Similar questions