LG dual mode display, switching modes onmly working partially?

Hello everyone :slight_smile:

A word of warning: I am a complete Linux and EOS freshy.
So far my experience was limited to Windows only for private and gaming usage -
and macOS for working purposes.
With building/partially upgrading my private PC I decided to go for a dual boot with Windows and (for now) EOS to see how far I can get and if it possible to get away from Windows entirely.
So I installed EOS this week, installed/made use the most important things for me like the browser as well as Steam for some CS2 sessions.
I have yet to play CS2 as I am experiencing some issues with my usual usage of the display and setting up everything in CS2 as I am used to.

Steam is installed with the amdvlk driver options (not sure if this was a mistake, I think those are the proprietary ones?)

[thorbenw@koerk-endeavour ~]$ lsmod | grep -P 'amd|ati|radeon'
amd_atl                57344  1
amdgpu              15482880  168
kvm_amd               237568  0
amdxcp                 12288  1 amdgpu
drm_exec               12288  1 amdgpu
gpu_sched              65536  1 amdgpu
kvm                  1388544  1 kvm_amd
drm_buddy              24576  1 amdgpu
i2c_algo_bit           20480  1 amdgpu
drm_suballoc_helper    12288  1 amdgpu
drm_ttm_helper         16384  2 amdgpu
ttm                   102400  2 amdgpu,drm_ttm_helper
drm_display_helper    266240  1 amdgpu
gpio_amdpt             16384  0
gpio_generic           24576  1 gpio_amdpt
crc16                  12288  3 bluetooth,amdgpu,ext4
ccp                   180224  1 kvm_amd
video                  81920  3 asus_wmi,amdgpu,asus_nb_wmi
[thorbenw@koerk-endeavour ~]$ pacman -Qs xf86-video-a
local/xf86-video-amdgpu 23.0.0-2 (xorg-drivers)
    X.org amdgpu video driver
local/xf86-video-ati 1:22.0.0-2 (xorg-drivers)
    X.org ati video driver

Hardware -
AMD 9800X3D
B650E Mainboard
AMD 6900XT
LG 32GS95UX

The issue I’m having is with the Display (and CS2).
The display is usually running on 4K with 240Hz, but has a dual mode which would switch to FullHD and 480 Hz. For more FPS in CS2 I usually switched the mode via a button on the display itself.
On Windows it automatically changes the resolution and increases the Hz.

With EOS… something changes and parts of the screen look FullHDish (Menus, Windows, Text) and some parts at least feel like they’re still displayed in 4K, like the background picture.
The configuration panel still says the resolution is 4K running 240Hz.

In CS2 settings it would run either with 4K or FullHD.
So I would be fine with just setting it to FullHD and let it run like that.
However I can’t set any refresh rate. It just shows a plain “0” and no option to change anything.

With the FPS overlay from Steam it gets pretty clear that the screen is running at 4K.
Meaning the Hz will also be 240 “only”.

Is there any chance somebody has experienced this behaviour as well or knows a possible solution?