For Sierra 10.12.1, you can try this;
Put the file DisplayProductID-59f1.plist into System>Library>Displays>Contents>Resources>Overrides>DisplayVendorID-1e6d.
Create the DisplayVendorID-1e6d directory if it not exist.
It gives native 2560 x 1080 with forced rgb edid patch (resolve the monitor...
you need to type the boot flag each time.
or you can edit your org.chameleon.Boot.plist in System/Library/Extensions
refer to my post here : http://www.tonymacx86.com/mountain-lion-desktop-support/98738-mountain-lion-boot-up-got-stuck-any-solution.html#post602595
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