Samsung (maker of the SyncMaster 2253BW) is of no help; explicitly - that's
what they say.
Search on "VESA configuration" returns information of interest only to
developers.
My "Displays" GUI lists only a few, lower resolutions.
Grub displays a very sharp, crisp extremely high resolution text menu that
tells me that Grub knows how to set the screen resolution.
Plus, at least one video card could utilize the 2253BW's native resolution;
that's the defunct Nvidia card from the discarded PC. That card is not an
option here.
Searches on [1680x1050 +"video card" +linux -nvidia] seem to return lots of
data on cards that don't work ...