I am trying to use an old Dell inspiron 1525 to run libreelec. Its display is broken and not available. I have connected HDMI port of the machine to my 4K TV through a 4K AV receiver. Although things work well, the resolution is stuck at 2048x1536. Only other resolution that is available is very low.
With 2048x1536, part of the display is not shown. I disabled overscan in TV and also tried video calibration, but I cannot get the lower edge of the picture to align to screen edge - For me it looks like this is because the resolution is not 16:9.
I tried this command but screen goes blank:
xrandr --output LVDS1 --off && xrandr --output HDMI1 --mode 1920x1080 --rate 60.00