xrandr
returns:
Screen 0: minimum 16 x 16, current 3440 x 1440, maximum 32767 x 32767 XWAYLAND0 connected primary 3440x1440+0+0 (normal left inverted right x axis y axis) 820mm x 350mm 3440x1440 99.96*+ 1920x1440 99.92 1600x1200 99.89 1440x1080 99.79 1400x1050 99.91 1280x1024 99.83 1280x960 99.78 1152x864 99.87 1024x768 99.75 800x600 99.66 640x480 99.77 320x240 99.32 1920x1200 99.90 1680x1050 99.85 1440x900 99.93 1280x800 99.91 720x480 99.31 640x400 99.73 320x200 98.84 2560x1440 99.97 2048x1152 99.88 1920x1080 99.82 1600x900 99.87 1368x768 99.80 1280x720 99.72 1024x576 99.86 864x486 99.84 720x400 99.68 640x350 99.12