ElementaryOS: Resolution fix for 2560×1440

Edit /usr/share/X11/xorg.conf.d/10-monitor.conf and paste the following:

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Section "Monitor"
Identifier "Monitor0"
Section "Monitor"
Identifier "Monitor0"
Modeline "2560x1440_60.00" 661.25 2560 2784 3064 3568 1440 1443 1448 1545 -hsync +vsync
EndSection
Section "Screen"
Identifier "Screen0"
Device "Virtual1"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "2560x1440_60.00"
EndSubSection
EndSection
Section "Monitor" Identifier "Monitor0" Section "Monitor" Identifier "Monitor0" Modeline "2560x1440_60.00" 661.25 2560 2784 3064 3568 1440 1443 1448 1545 -hsync +vsync EndSection Section "Screen" Identifier "Screen0" Device "Virtual1" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 Modes "2560x1440_60.00" EndSubSection EndSection
Section "Monitor"
  Identifier "Monitor0"
  Section "Monitor"
  Identifier "Monitor0"
  Modeline "2560x1440_60.00"  661.25  2560 2784 3064 3568 1440 1443 1448 1545 -hsync +vsync
EndSection
Section "Screen"
  Identifier "Screen0"
  Device "Virtual1"
  Monitor "Monitor0"
  DefaultDepth 24
  SubSection "Display"
    Depth 24
    Modes "2560x1440_60.00"
  EndSubSection
EndSection

And reboot system with sudo reboot

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# sudo reboot
# sudo reboot
# sudo reboot

Thanks!