Well, DPI == dots per inch, so it's expected to be imperial ;-)
Thanks for your help.... it looks like the new driver 1.0-8174 actually gets it right on my system 75dpi. I had to reset all fonts a little bigger in KDE, but when I visit this site:
The fonts in the message board are real crap. I messed at first with KDE fonts settings, but nothing worked. Setting `startx -- -dpi 85' fixes it, but then desktop fonts seem a bit blurry. 75DPI is good, though - clear as a bell. It must be that web site - but I am not convinced yet.
Again, thanks for help.