I am also hit by this bug on a HP Compaq nx7400 with Intel 945GM.
Following https://wiki.ubuntu.com/X/Troubleshooting/HugeFonts it seems
to be related to bad monitors. Since the several posts and bugs about
the issue, I am writing as reference the following workarounds:


1) For the giant fonts making the KDE session unusable, here it is how I solved 
the issue:

- after booting, ctrl-alt-F6 to go to a terminal session;
- login with username and password;
- type sudo nano .kde/share/config/kcmfonts
- set DPI to 96 by editing the relevant line into: forceFontDPI=96
- save following on screen instructions
- restart the session or reboot

I adapted a suggestion made in this thread 
http://kubuntuforums.net/forums/index.php?topic=3107128.0
since the xterm trick did not work for me. 


2) For KDM, similarly to the GDM case, one has to add "-dpi 96" to the line 
"ServerCmd=/usr/bin/X" in "/etc/kde4/kdm/kdmrc" (all without brackets 
obviously, I have just put them to distinguish relevant instructions from 
normal text). This solve the giant fonts issue in the login screen. I have 
adapted an old discussion from 
http://kubuntuforums.net/forums/index.php?topic=3087975.0


Hope it helps.

-- 
[i945GM] Huge font size in KDE and GDM. Makes KDE unusable 8.04-9.10.
https://bugs.launchpad.net/bugs/429102
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