ElementaryOS: Resolution fix for 2560×1440

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

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

# sudo reboot

Thanks!