Enable old style KDM login prompt
From MEPIS Documentation Wiki
Starting with 6.5, MEPIS uses the "themed" KDM login prompt by default. If you prefer the traditional KDM login prompt, you can switch it back by changing one line the the KDM configuration file.
as root edit /etc/kde3/kdm/kdmrc
kdesu kwrite /etc/kde3/kdm/kdmrc
in the first [X-*-Greeter] section
edit line:
UseTheme=true
change it to :
UseTheme=false

