Apple M1 - LG 4k monitor, not showing 2560 x 1440 resolution?

[jzzz]

Originally Posted by jzzz

Update:

I was able to use the LG monitor with 1280x720. No signal at all if I choose the other three options (3840x2160, 1920x1080, nor 1600x900). I am using a M1 Macbook Air with OS 11.1, targus dock310, lg32uk50t, connection hdmi to hdmi.

Any ideas on how to make it display better?

Thanks!

Last update:
Problem solved: find a different HDMI cable. Apparently they have different capabilities albeit the same look.

[occino@gmx.de]

Click on "Scaled" while holding down the alt key gives you more resolutions.

[mattsm]

There is def a missing resolution on my Dell 4K monitor as well. Makes the device unusable on the same setup. Works fine on my Intel based MB

[anthlover]

So I updated to DisplayLink 1.3 on both my M1 and 15 MacBook Pro 2017. Nice to have a universal binary.

Interestingly the 1440 resolution on my LG 4K display works correctly only 2017 not the M1. So I am back to using Displaylink on only 1 monitor and using a USB-C to Displayport or HDMI adapter directly for the LG. This solution has in is fine for me. I feel it makes the setup more stable in clamshell mode and during boot up.

None the less it would be nice if it worked as it should. I have to play a little further as well I think I noticed a new anomaly on at least 1 of my two computers. Even with the lid shut 1.3 DisplayLink was advertising the built in display on 2017 MacBook Pro, but not my M1. Naturally with the lid shut this display should not be active.

[Ryan0751]

I was hoping the 1.3 update would let me use additional retina modes on my LG 4K 32" display, but the options are the same as with 1.2: Either full 4K (too tiny for me), or 1080p (too big).

[anthlover]

You do not mention your Display link device or Mac model and how many displays you have, In my case I have an M1 Air and 15 inch Retina (two 32 inch displays [1 4K LG like yours and one 1440]). I do have both a thunderbolt dock as well Display link basked Targus 180. Generally Thunderbolt docs are better generally for Intel MACS as no driver is required at all and of course thunderbolt runs at 40Gbs second versus 5GB for most USB-C/displaylink based devices. Plenty for most uses, but not all.

None the less with my Targus 180 having so many ports including power delivery for either computers even my M1 has a port free. So I run my 4K display direct via a USB-C display port adapter (you can do the same with a USB-C to HDMI as well).

This increases the reliability of clam shell mode, solves the 1440 on 4K display issue and more.

In my case I ended up using the Targus for both computers even though the 15 inch Retina spends 85 percent of the time at the Dock. It much less recabling that way,

[Ryan0751]

Originally Posted by anthlover

You do not mention your Display link device or Mac model and how many displays you have, In my case I have an M1 Air and 15 inch Retina (two 32 inch displays [1 4K LG like yours and one 1440]). I do have both a thunderbolt dock as well Display link basked Targus 180. Generally Thunderbolt docs are better generally for Intel MACS as no driver is required at all and of course thunderbolt runs at 40Gbs second versus 5GB for most USB-C/displaylink based devices. Plenty for most uses, but not all.

None the less with my Targus 180 having so many ports including power delivery for either computers even my M1 has a port free. So I run my 4K display direct via a USB-C display port adapter (you can do the same with a USB-C to HDMI as well).

This increases the reliability of clam shell mode, solves the 1440 on 4K display issue and more.

In my case I ended up using the Targus for both computers even though the 15 inch Retina spends 85 percent of the time at the Dock. It much less recabling that way,

I have the MBP M1 and dual LG 32UL950W displays, and am using the StarTech USB 3.0 to Dual DisplayPort adapter.