limited to 30hz and laggy OS

[99 others]

Hi,

I just got my MB M1 Pro 16 and it is unable to connect to my external monitor with HDMI 60hz. 30 hz is the maximum.

I tried 2 different HDMI cables (2.0 and 2.1) with my LG27UD68-W (has HDMI and display port 1.4) screen an a Samsung 4k 60 hz screen (only HDMI).

On my Windows tower, 60hz is working with both cables and both screens.

Even when I use the external screen with 30hz, Safari becomes laggy on my MBP screen and scrolling is not possible any more. The lag stops when I pull out the HDMI cable from my MBP.

I even tried out the EasyRes app but it does not show a 60hz option.

Is there any know solution? It is quite annoying...

Thank you very much.

 

[cmaier]

Hi,

I just got my MB M1 Pro 16 and it is unable to connect to my external monitor with HDMI 60hz. 30 hz is the maximum.

I tried 2 different HDMI cables (2.0 and 2.1) with my LG27UD68-W (has HDMI and display port 1.4) screen an a Samsung 4k 60 hz screen (only HDMI).

On my Windows tower, 60hz is working with both cables and both screens.

Even when I use the external screen with 30hz, Safari becomes laggy on my MBP screen and scrolling is not possible any more. The lag stops when I pull out the HDMI cable from my MBP.

I even tried out the EasyRes app but it does not show a 60hz option.

Is there any know solution? It is quite annoying...

Thank you very much.

Not sure if relevant to you, but my LG monitor has 2 HDMI ports and a displayport, and only the second HDMI port (and the displayport) supports 60Hz at 4k. It was driving me crazy trying to figure it out until i swapped inputs on the back of the monitor.

 

[99 others]

Not sure if relevant to you, but my LG monitor has 2 HDMI ports and a displayport, and only the second HDMI port (and the displayport) supports 60Hz at 4k. It was driving me crazy trying to figure it out until i swapped inputs on the back of the monitor.

I tried it out but but it does not make any difference...

 

[mi7chy]

Looks like others have run into the issue in the past and found a solution.

https://forums.macrumors.com/thread...pro-2017-4k-lg-27ud68-w.2098203/post-25658995

 

[99 others]

Looks like others have run into the issue in the past and found a solution.

https://forums.macrumors.com/thread...pro-2017-4k-lg-27ud68-w.2098203/post-25658995

Thank you so much!!! It worked out! So happy.

 

[99 others]

I'm back. The system is still very laggy when used with an external monitor even if it's better than before. It is perhaps a mac os issue.