4k tv scaling

Hello, I'm running Zorin OS 18 Core on my laptop (ryzen 7 5800h, rtx 3070) with x11 and latest nvidia drivers, and no matter what I try, I can't get 200% scaling on my 4k roku tv. I have laptop display, my 2nd (main) monitor, and this tv as 3rd monitor. TV is connected through hdmi. If I try to set 200% scale in display settings, two things happen: either nothing happens, or whole system scales to 200%, sometimes with bugs of ui. I tried xandr, but it just break the image on tv completely until reboot, everithing shifts. Anyways I can get it work?

Welcome to the Forum!

Is this a straight HDMI to HDMI Connection or is there an Adapter or Hub or something? When You go to Settings>Displays is Your TV listed there?

Yes, straight hdmi to hdmi. My tv is listed in the settings and I'm able to change resolution or refresh rate, but when I click on 200% scaling things that I mentioned above are happen

When You unplug the other Monitor, does it work then? Have You the Possibility to switch the HDMI Ports?

Unfortunately - not working and I have only 1 hdmi in my laptop. The only solution I found for now is to change tv resolution to 1080p, but it's reduces quality a lot

Could You post the Output of the Command xrandr please?

That's when I have TV hdmi disconnected:

xrandr
Screen 0: minimum 320 x 200, current 4480 x 1440, maximum 16384 x 16384
eDP-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080    165.00*+
   1680x1050    165.00  
   1280x1024    165.00  
   1440x900     165.00  
   1280x800     165.00  
   1280x720     165.00  
   1024x768     165.00  
   800x600      165.00  
   640x480      165.00  
DP-1-0 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 connected primary 2560x1440+1920+0 (normal left inverted right x axis y axis) 600mm x 340mm
   2560x1440     59.95 + 279.96*  239.97   143.91   120.00  
   1920x1080    239.76   119.88    60.00    59.94    50.00    29.97    25.00    23.98  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x720      59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-1-3 disconnected (normal left inverted right x axis y axis)
HDMI-1-0 disconnected (normal left inverted right x axis y axis)
DP-1-4 disconnected (normal left inverted right x axis y axis)

That's when I have everything connected (also what I noticed, if I'm already running a session and connect TV hdmi and then turn it on, I'm losing my desktop background image - attaching screenshot below):

xrandr
Screen 0: minimum 320 x 200, current 8320 x 2160, maximum 16384 x 16384
eDP-1 connected 1920x1080+3840+548 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080    165.00*+
   1680x1050    165.00  
   1280x1024    165.00  
   1440x900     165.00  
   1280x800     165.00  
   1280x720     165.00  
   1024x768     165.00  
   800x600      165.00  
   640x480      165.00  
DP-1-0 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 connected primary 2560x1440+5760+351 (normal left inverted right x axis y axis) 600mm x 340mm
   2560x1440     59.95 + 279.96*  239.97   143.91   120.00  
   1920x1080    239.76   119.88    60.00    59.94    50.00    29.97    25.00    23.98  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x720      59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-1-3 disconnected (normal left inverted right x axis y axis)
HDMI-1-0 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 1430mm x 800mm
   3840x2160     30.00 +  59.94*   29.97    23.98  
   4096x2160     59.94    29.97    24.00    23.98  
   1920x1080     60.00    59.94    29.97    23.98  
   1680x1050     59.95  
   1440x900      59.89  
   1360x768      60.02  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1280x800      59.81  
   1280x720      60.00    59.94    29.97    23.98  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32  
   720x480       59.94  
   640x480       75.00    72.81    59.94    59.93  
DP-1-4 disconnected (normal left inverted right x axis y axis)

.bump.

Is Your HDMI Cable one for HDMI 2.1? And the HDMI Ports: Are they 2.1, too?