If you use debian sid, and you upgraded to xserver-xorg 7.0.14, and you then found that emacs in graphical mode was useless due to broken fonts, the solution is this:
/etc/X11/xorg.conf (remember that you can use emacs within a terminal with emacs -nw)/usr/lib/X11/fonts with /usr/share/fonts/X11/dpkg-reconfigure x-ttcidfont-conf