RE: x-display-pixel-width/height inconsistency

[Drew Adams]

> > Not sure whether this is exactly what you have in mind (it 
> > does nothing special wrt multiple displays).  But FWIW,
> > command `maximize-frame' in `frame-cmds.el' does that.
> > It also lets users reserve part of the display for the MS
> > Windows task bar or for the Mac "smart tool bar" (or whatever).
> 
> On big screens I don't have emacs maximised by default, I have
> width x height specific to the resolution.

And?  How is that relevant?
What is the behavior you seek?