Set KDM’s font DPI on openSUSE

If the fonts on your KDM login screen are too large, for example after connecting an external monitor, edit /etc/sysconfig/displaymanager as root. Add -dpi <value> to the existing value of DISPLAYMANAGER_KDM_LOCALARGS, replacing <value> with the desired DPI.

For example, to use 75 DPI:

DISPLAYMANAGER_KDM_LOCALARGS="-dpi 75"

After saving the file, restart KDM as root:

rcxdm restart