Using the EDID data your monitor reports in the Xrandr.txt attachment above I get the same answer of 60x34cm so that is what the hardware is advertising itself as. Indeed that would make it 27.15 inches diagonal. So this is a bug IN your hardware, sorry. You might be able to get a firmware update from LG. Most likely they are using the same firmware in their 27" monitors and forgot to change the dimensions for your 43" model. --- EDID version: 1.4 Manufacturer: GSM Model 23305 Serial Number 259449 Made in week 3 of 2019 Digital display 10 bits per primary color channel DisplayPort interface Maximum image size: 60 cm x 34 cm Gamma: 2.20 DPMS levels: Standby Supported color formats: RGB 4:4:4, YCrCb 4:4:4, YCrCb 4:2:2 Default (sRGB) color space is primary color space First detailed timing includes the native pixel format and preferred refresh rate Color Characteristics Red: 0.6523, 0.3349 Green: 0.3046, 0.6367 Blue: 0.1484, 0.0615 White: 0.3134, 0.3291 Established Timings I & II 640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (DMT) 800x600 60.317 Hz 4:3 37.879 kHz 40.000 MHz (DMT) 1024x768 60.004 Hz 4:3 48.363 kHz 65.000 MHz (DMT) Standard Timings 1152x864 59.959 Hz 4:3 53.783 kHz 81.750 MHz (EDID 1.4 source: CVT) 1152x864 60.000 Hz 4:3 53.700 kHz 81.624 MHz (EDID 1.3 source: GTF) 1280x1024 60.020 Hz 5:4 63.981 kHz 108.000 MHz (DMT) 1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz (DMT) 1600x900 60.000 Hz 16:9 60.000 kHz 108.000 MHz (DMT, RB) 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (DMT) 1280x800 59.810 Hz 16:10 49.702 kHz 83.500 MHz (DMT) Detailed mode: Clock 533.250 MHz, 600 mm x 340 mm 3840 3888 3920 4000 ( 48 32 80) 2160 2214 2219 2222 ( 54 5 3) +hsync -vsync VertFreq: 59.997 Hz, HorFreq: 133.312 kHz Detailed mode: Clock 266.640 MHz, 600 mm x 340 mm 3840 3848 3992 4000 ( 8 144 8) 2160 2214 2219 2222 ( 54 5 3) +hsync -vsync VertFreq: 30.000 Hz, HorFreq: 66.660 kHz Display Range Limits Monitor ranges (GTF): 56-61 Hz V, 30-135 kHz H, max dotclock 560 MHz Display Product Name: LG Ultra HD Has 1 extension block Checksum: 0x2a ---------------- CTA-861 Extension Block Revision 3 Basic audio support Supports YCbCr 4:4:4 Supports YCbCr 4:2:2 1 native detailed modes 13 bytes of CTA data blocks Video Data Block 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (VIC 16, native) 1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz (VIC 4) 720x480 59.940 Hz 16:9 31.469 kHz 27.000 MHz (VIC 3) 640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (VIC 1) Audio Data Block Linear PCM, max channels 2 Supported sample rates (kHz): 48 44.1 32 Supported sample sizes (bits): 24 20 16 Speaker Allocation Data Block Speaker map: FL/FR - Front Left/Right Detailed mode: Clock 148.500 MHz, 600 mm x 340 mm 1920 2008 2052 2200 ( 88 44 148) 1080 1084 1089 1125 ( 4 5 36) +hsync +vsync VertFreq: 60.000 Hz, HorFreq: 67.500 kHz Detailed mode: Clock 241.500 MHz, 600 mm x 340 mm 2560 2608 2640 2720 ( 48 32 80) 1440 1443 1448 1481 ( 3 5 33) +hsync -vsync VertFreq: 59.951 Hz, HorFreq: 88.787 kHz Checksum: 0xc8