Make 1680x1050 and 1440x900 resolution available on Intel 82852/82855 GM/GME Chipset

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A couple of days ago I purchased a shiny new SyncMaster 226cw monitor to replace broken display on my friend’s laptop (which he kindly lent me, so I could work at home sometimes). After installing fresh MS Windows copy using the 226cw connected through VGA (CRT) port (actually it was only way I found to set output to external monitor as default option for normally staring Windows), I was realized what there is no way to set native 1680x1050 resolution for 226cw even after latest SyncMaster drivers were installed. And here the quest began...

There was no problem to figure out what the trouble is in the graphical chipset which is Intel 82852/82855 GM/GME. But it was unclear how to overcome this and is it possible at all. Intel has this problem solved only in more new chipsets – no straight way to fix. Fortunately I found this discussion and this article. And by the way the problem was almost solved, but almost only. There was still one unknown artifact, so called Modeline or DTD from 226cw. At last I found one suitable. So now I can describe how to force 852/855 chipset to work properly with your monitor's native resolution