LG Monitor only does 30Hz at 4K connected to HDMI on Macbook Pro M2 Max

that appears to be a 4K display with potential for HDR (10 bits/color)

it features connections:

HDMI Yes x2 (ver 2.0)

DisplayPort Yes x1 (ver 1.2)

Your Display supporting HDMI 2.0 4K at 60 with 10 bits/color over ONE HDMI 2.0 cable is wishful thinking for a Mac environment. Maybe you could get it up that way for Windows.

You could connect to that display to your Mac with TWO HDMI 2.0 cables, each of which would carry half the display data (left or right) and the Display could use Picture-By-Picture feature to put the two halves back together. Readers who have done this report it works very nicely, and provides a seamless experience.

The Mac does not support using HDMI 2.0 for 4K at 60 with HDR enabled, because it exceeds the required bandwidth and only works if you drop the encoding for number of colors to use 4:2:0 sub-sampling

Your model Mac DOES support 4K at 60 with HDR enabled, but it requires HDMI 2.1 and a special ULTRA-certified HDMI cable. Your display does not appear to support HDMI 2.1, which uses a different electrical interface and is NOT backward-compatible.

USB-C to DisplayPort cable/adapter works just fine with a high spec cable under ONE meter in length, and supports 4K at 60 10 bits/color directly, no fiddling.

Also, updated the LG display firmware? How to update that is certainly cryptic, but the software manual does indicate it’s possible: “Firmware updates are available in the Monitor Settings Menu when connecting the monitor firmware update feature supported model. For monitor firmware updates, a USB cable (USB type C to A/USB type A to B) must be connected to the PC”

your initial post had NO hard information. There was no way to know if maybe you had exceeded any specifications or limits or anything else.

I asked about models of displays because if you had posted the model, I could look up the specs.

HDMI was invented for HD TV sets, its use in large screen computer has pushed it well beyond is breaking point. EXACTLY what computer trying to talk to EXACTLY what display using EXACTLY what cable makes a difference between working or not.

Oh, by the way, if you would like some help, how about telling readers which of the DOZENS of LG displays you are connecting, and whether you are using High Dynamic Range (10-bits/color)

And if you want to compare and contrast with a Dell display, how about the model and/or specs for that one as well?

I feel for you. you certainly have some thorny issue on your hands.