M1 MBA and LG Ultrafine 5k

[toddpeperkorn]

I have an LG Ultrafine 5K (27MD5KA-B) and I want to use with my an M1 MBA. When I hook it up, it only shows 2560x1440. I think that means it's only showing one of the 2 threads for the monitors, but that's about my limit of it.

Anyone else having this problem? Suggestion? LG doesn't publicly say they support Big Sur at all, so they are useless.

Todd

 

[joevt]

The monitor's two tiles are 2560x2880.

Make sure it's the only display connected to Thunderbolt.

Check the Thunderbolt connection. If it doesn't say 40 Gb/s x1 then you need to try a different cable.

Use the script at https://gist.github.com/joevt/e862b0088ef58b9144877d01401bcee8 to see what timing is currently being used.

 

[joevt]

Conversation moved to https://forums.macrumors.com/threads/m1-with-lg-5k-27md5ka-b.2270018/post-29701959