How to change display from 1920x1080 to 3840x2160 (got a new monitor)

I just picked up a decently used LG 27" 27BK67U-B.

Looks identical to this model on Amazon, but my ports are arranged differently. It says resolution is 3840 x 2160.

The colors sure are more crisp and much brighter, compared to my old-ass Samsung that I have been using for years.

I run xrandr | grep connected and it outputs

eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 340mm x 190mm
HDMI1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 480mm x 270mm

How do I change display to 3840x2160?

EndeavourOS + bspwm on Thinkpad E590.

Enumerate the names of all your video outputs, and the possible resolutions for those currently connected to a monitor:

xrandr -q

Choose the name of the output you wish to change the resolution of, and:

xrandr --output <OUTPUT> --mode 3840x2160

Note: If running from a text terminal, that is not running in gfx environment, you’ll have to add a -d :0 parameter, i.e:

xrandr -d :0 -q
xrandr -d :0 --output <OUTPUT> --mode 3840x2160


I confirmed this is indeed a 2.0 HDMI cable. Was using an older one, but my roommate had an extra.

xrandr: cannot find mode 3840x2160

What’s the next step?!

do you use a DE like kde, gnome? system setting - display

I made sure this model laptop can output up to that resolution, and it looks like it can.

SO, now I am stumped :thinking:

bspwm amigo :+1:

xrandr and arandr are both only showing max 1920x1080. And I verified that my HDMI cable is indeed a 2.0 so it should be able to handle it.

Even the laptop specs should handle it.

not fimilar with wm. sorry :grimacing:

The specs of your laptop are confusing:

On the one side it says it supports high res on HDMI (but only with 24 Hz):

Bildschirmfoto vom 2023-04-13 07-39-15

but on the other side it says that the HDMI port is just 1.4b:

Bildschirmfoto vom 2023-04-13 07-37-50

I suggest you try USB-c resp. DisplayPort.