/usr/share/X11/xorg.conf.d/5-monitor.conf

$ cat 5-monitor.conf
Section "Monitor"
   Identifier "Monitor0"
   Modeline "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync
   Modeline "1368x768_75.00"  109.50  1368 1448 1592 1816  768 771 781 805 -hsync +vsync
   Modeline "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync
   Modeline "1680x1050_75.00"  187.00  1680 1800 1976 2272  1050 1053 1059 1099 -hsync +vsync
   Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
EndSection
Section "Device"
   Identifier "Device0"
   Driver "intel"
EndSection
Section "Screen"
   Identifier "Screen0"
   Device "Device0"
   Monitor "Monitor0"
   DefaultDepth 24
   SubSection "Display"
      Depth 24
      Modes "1920x1080_60.00"
   EndSubSection
EndSection