[SOLVED] Can't get full UHD on LG-43UD79 and cMP

[NY Guitarist]

Unable to get full UHD (3840 x2160) on a new LG- 43UD79 monitor.

Even though this is a 43" monitor System Report shows monitor as 27" LG with native 3840. I can ONLY get 1920 at 'default' setting in monitor preference pane, but I can scale up to 3360x1890.

If I set monitor to 'under scan' I can then scale up to 3780x2160 at either 30/60hz, which is also the new 'default' setting as far as OS thinks.


ANSWER: Setting LG monitor to 'underscan' to get a higher scale resolution prevents MacOS from ability to use 'option' when selecting 'scaled' to choose 3840.

Thank you LG customer support. Only thing they couldn't answer is that 3840 is scaled or 1:1 pixel ratio.

Hmmm.

I'm seriously liking this monitor for how much it has changed my workflow for the better.

 

[xxbass]

How about upgrading to Mojave? Another 4k GPU available? I was thinking buying the same LG (cMP 5.1, AMD R9 280X, Mojave) and not getting default 4k would surely make LG happy, but not me.

 

[NY Guitarist]

How about upgrading to Mojave? Another 4k GPU available? I was thinking buying the same LG (cMP 5.1, AMD R9 280X, Mojave) and not getting default 4k would surely make LG happy, but not me.

Unfortunately I have software with many plugins that aren't upgraded yet. I may try Mojave on another MP 5.1 I have but the video card may not be up to the task.

 

[minvoyager]

Unable to get full UHD (3840 x2160) on a new LG- 43UD79 monitor.

Even though this is a 43" monitor System Report shows monitor as 27" LG with native 3840. I can ONLY get 1920 at 'default' setting in monitor preference pane, but I can scale up to 3360x1890.

If I set monitor to 'under scan' I can then scale up to 3780x2160 at either 30/60hz, which is also the new 'default' setting as far as OS thinks.


ANSWER: Setting LG monitor to 'underscan' to get a higher scale resolution prevents MacOS from ability to use 'option' when selecting 'scaled' to choose 3840.

Thank you LG customer support. Only thing they couldn't answer is that 3840 is scaled or 1:1 pixel ratio.

I just purchased the same LG 43" 43UD79, and have the same the same problem. In your solution, you mentioned setting it to "underscan". I don't see where that setting is. Can you give more details?