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
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https://bugs.launchpad.net/bugs/1902721
Title:
xrandr fails to set screen size while starting X11
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