In theory you should never need to use 'xrandr' at all... I've decoded your monitor's EDID data and got:
EDID version: 1.3 Manufacturer: PHL Model 2290 Serial Number 174 Made in week 46 of 2016 Digital display Maximum image size: 62 cm x 34 cm Gamma: 2.20 DPMS levels: Off RGB color display First detailed timing is preferred timing Color Characteristics Red: 0.6298, 0.3408 Green: 0.3095, 0.6259 Blue: 0.1562, 0.0605 White: 0.3134, 0.3291 Established Timings I & II 720x400 70.082 Hz 9:5 31.467 kHz 28.320 MHz (IBM) 640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (DMT) 640x480 66.667 Hz 4:3 35.000 kHz 30.240 MHz (Apple) 640x480 72.809 Hz 4:3 37.861 kHz 31.500 MHz (DMT) 640x480 75.000 Hz 4:3 37.500 kHz 31.500 MHz (DMT) 800x600 60.317 Hz 4:3 37.879 kHz 40.000 MHz (DMT) 800x600 75.000 Hz 4:3 46.875 kHz 49.500 MHz (DMT) 1024x768 60.004 Hz 4:3 48.363 kHz 65.000 MHz (DMT) 1024x768 75.029 Hz 4:3 60.023 kHz 78.750 MHz (DMT) 1280x1024 75.025 Hz 5:4 79.976 kHz 135.000 MHz (DMT) Standard Timings 1920x1080 60.000 Hz 16:9 67.500 kHz 148.500 MHz (DMT) 1280x1024 60.020 Hz 5:4 63.981 kHz 108.000 MHz (DMT) 1280x960 60.000 Hz 4:3 60.000 kHz 108.000 MHz (DMT) 1440x900 74.984 Hz 16:10 70.635 kHz 136.750 MHz (DMT) 1440x900 59.887 Hz 16:10 55.935 kHz 106.500 MHz (DMT) 1680x1050 59.954 Hz 16:10 65.290 kHz 146.250 MHz (DMT) 1280x720 60.000 Hz 16:9 45.000 kHz 74.250 MHz (DMT) Detailed mode: Clock 533.250 MHz, 621 mm x 341 mm 3840 3888 3920 4000 ( 48 32 80) 2160 2163 2168 2222 ( 3 5 54) +hsync -vsync VertFreq: 59.997 Hz, HorFreq: 133.312 kHz Detailed mode: Clock 262.750 MHz, 621 mm x 341 mm 3840 3888 3920 4000 ( 48 32 80) 2160 2163 2168 2191 ( 3 5 23) +hsync -vsync VertFreq: 29.981 Hz, HorFreq: 65.688 kHz Display Product Name: PHL 288P6L Display Range Limits Monitor ranges (GTF): 23-80 Hz V, 30-99 kHz H, max dotclock 600 MHz Has 1 extension block Checksum: 0x4c ---------------- CTA-861 Extension Block Revision 3 Underscans PC formats by default Basic audio support Supports YCbCr 4:4:4 Supports YCbCr 4:2:2 1 native detailed modes 47 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) 1920x1080 50.000 Hz 16:9 56.250 kHz 148.500 MHz (VIC 31) 1280x720 50.000 Hz 16:9 37.500 kHz 74.250 MHz (VIC 19) 640x480 59.940 Hz 4:3 31.469 kHz 25.175 MHz (VIC 1) 720x576 50.000 Hz 16:9 31.250 kHz 27.000 MHz (VIC 18) 3840x2160 24.000 Hz 16:9 54.000 kHz 297.000 MHz (VIC 93) 3840x2160 25.000 Hz 16:9 56.250 kHz 297.000 MHz (VIC 94) 3840x2160 30.000 Hz 16:9 67.500 kHz 297.000 MHz (VIC 95) 3840x2160 50.000 Hz 16:9 112.500 kHz 594.000 MHz (VIC 96) 3840x2160 60.000 Hz 16:9 135.000 kHz 594.000 MHz (VIC 97) 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 Vendor-Specific Data Block, OUI 0x000c03 (HDMI) Source physical address 1.4.0.0 DC_36bit DC_30bit DC_Y444 DVI_Dual Maximum TMDS clock: 600 MHz Extended HDMI video details: HDMI VICs: 3840x2160 30.000 Hz 16:9 67.500 kHz 297.000 MHz (HDMI VIC 1) 3840x2160 25.000 Hz 16:9 56.250 kHz 297.000 MHz (HDMI VIC 2) 3840x2160 24.000 Hz 16:9 54.000 kHz 297.000 MHz (HDMI VIC 3) Vendor-Specific Data Block, OUI 0xc45dd8 (HDMI Forum) Version: 1 Maximum TMDS Character Rate: 600 MHz SCDC Present Supports 12-bits/component Deep Color 4:2:0 Pixel Encoding Supports 10-bits/component Deep Color 4:2:0 Pixel Encoding Extended tag: YCbCr 4:2:0 Capability Map Data Block 3840x2160 50.000 Hz 16:9 112.500 kHz 594.000 MHz (VIC 96) 3840x2160 60.000 Hz 16:9 135.000 kHz 594.000 MHz (VIC 97) Detailed mode: Clock 74.250 MHz, 621 mm x 341 mm 1280 1390 1430 1650 (110 40 220) 720 725 730 750 ( 5 5 20) +hsync +vsync VertFreq: 60.000 Hz, HorFreq: 45.000 kHz Detailed mode: Clock 27.000 MHz, 621 mm x 341 mm 720 736 798 858 ( 16 62 60) 480 489 495 525 ( 9 6 30) -hsync -vsync VertFreq: 59.940 Hz, HorFreq: 31.469 kHz Detailed mode: Clock 277.250 MHz, 621 mm x 341 mm 1920 1968 2000 2080 ( 48 32 80) 2160 2163 2173 2222 ( 3 10 49) +hsync -vsync VertFreq: 59.988 Hz, HorFreq: 133.293 kHz Detailed mode: Clock 297.000 MHz, 621 mm x 341 mm 3840 4016 4104 4400 (176 88 296) 2160 2168 2178 2250 ( 8 10 72) +hsync -vsync VertFreq: 30.000 Hz, HorFreq: 67.500 kHz Checksum: 0x9d ** Package changed: xorg (Ubuntu) => x11-xserver-utils (Ubuntu) ** Also affects: xorg-server (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to x11-xserver-utils in Ubuntu. https://bugs.launchpad.net/bugs/1902721 Title: xrandr fails to set screen size while starting X11 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/x11-xserver-utils/+bug/1902721/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp