What happens when you activate bezel management?
If you think the custom res is at fault then try removing GXM and nVidia drivers then install nv177.41 and the GXM, it will add the mode correctly.
All editing the Deviceinfo file does is stop the GXM removing the custom res, it doesnt add it. You can edit it with any text editor (Notepad preferred).
To confirm your monitor in Devicemanager is listed as Matrox Triplehead2go yes?
Since you are calling this a scalling issue (doesnt sound like one) have you changed the GPU vs Display scalling option in the Nvidia Control Panel?
_________________ [GTX1080 - 4.48GHz 4690k - planning projector mayhem]
|