"I've never been able to get dual screen working."
"I haven't been able to get panning/virtual working since 11.4 or 12.1."
"How can I force DPI/make everything on the desktop bigger?"

Several such combinations work here in 12.3 & up. Xorg.conf still works to set them up if no panning or scaling are required, but since I often do, I often put http://fm.no-ip.com/Share/setup in /etc/X11/xinit/xinitrc.d/setup as 0755 with whichever line I want used uncommented for xrandr to perform the configuration as X loads instead of trying to use DE tools after the fact. Whether x is actually needed I never get around to testing. Same principles apply to setup multihead.

http://fm.no-ip.com/Share/ contains several xorg.conf files that work to configure multihead with FOSS drivers for Intel, ATI & NVidia gfxchips.

Latest KDE version users since mid-summer of 2013 have had krandr replaced with kscreen, which is supposed to have made multihead easy to setup without touching files in /etc/X11/. That's not something I've tried, since I'm happy to setup X globally in /etc/X11/ and disable kscreen in users' ~/.kde4/share/config/kdedrc with:

        [Module-kscreen]
        autoload=false

Forcing DPI globally works same as always through xorg.conf, but may be overridden by the DE, either optionally (e.g. KDE) or not (Gnome3?).
--
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/
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