Simply change your "Monitor" section in /etc/X11/xorg.conf to look like
this then restart your X server:
Section "Monitor"
Identifier
"<YOU_HAVE_TO_USE_THE_IDENTIFIER_YOU_HAVE_IN_YOUR_XORG.CONF>"
Option "DPMS"
HorizSync 28-83
Modeline "1680x1050 at 60.0" 146.25 1680 1784 1960 2240 1050 1053
1059 1089 +hsync -vsync
Option "PreferredMode" "1680x1050 at 60.0"
VertRefresh 56-75
EndSection
--
X selects wrong modeline for LG Flatron L222WS
https://bugs.launchpad.net/bugs/212018
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