Will submit inxi later as I am remote from computer. However when attempting to change resolution from 4k to 1080P it ends up failing with with an output error (A new output has been added. Settings have been reloaded) message. What I did notice is that KDE is displaying an odd refresh rate of 30HZ. Thought it might have been just a Garuda issue, however using Big Linux (Manjaro Based) to test under live environment, I get the same output error and same refresh rate of 30HZ.
I’ve attempted to make the changes on Gnome and not only did it work, it also displayed (Correct) refresh rate of 120HZ.
Again I will submit INXI later but hoping someone has had this experience and can suggest a possible fix, not looking to go to gnome
using Wayland I can change resolution, however still shows 30HZ for a refresh rate, not a fan of Wayland as many applications like spotify flatpak does not work. Only under X11.
xrandr
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 16384 x 16384
HDMI-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
3840x2160 30.00*+ 25.00 24.00 29.97 23.98
4096x2160 30.00 25.00 24.00 29.97 23.98
1920x1080 120.00 100.00 119.88 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1280x1024 60.02
1360x768 60.02
1152x864 59.97
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
720x400 70.08
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
Had this same issue when I switched from the older DP cables to newer HDMI (2.1) cables on my monitors. I just plugged it in the other HDMI port to solve the issue. Some people are not aware that different ports sometimes support different standards (i.e. refresh rate).
So I’d recommend trying other ports.
EDIT:
Just saw your mention of Gnome. Not sure why it works there but not in Plasma. Guess I’ll leave my original response in case it’s helpful to anyone.
So tried changing the HDMI port on the TV and computer, no progress there. I’m finding out I can use a USB C to HDMI cable to project. Ordered it yesterday, will report back once I receive it.
I’ve tried every combination to get Garuda working on my LG TV via KDE. Purchased different cables tried different ports, etc. Nothing worked. Looks like I’m destined to go with Garuda Gnome and go the extensions route to make it usable.
It’s on the AUR though.
Funnily enough, I’ve found everything I’ve ever looked for. I’ve had to manually compile nothing (outside of using paru). Of course, not everyone is comfortable with using AUR packages though.