Version:            (using KDE KDE 3.1.4)
Installed from:    Debian stable Packages
Compiler:          gcc 2.95.4 
OS:          Linux

Displaying non-latin1 real names in the KDM login screen works incorrectly.

Try this: enter some UTF-8 data in user's GECOS field, restart KDM. You will not see any non-latin1 character, only Ž, Ų, ÅŖ, etc.

When real names contain 8bit  characters from, for example latin7, they are translated to latin1 equivalents (aogonek to agrave, zcaron to thorn, etc).

The problem is in KGreeter::insertUser(UserListView*, const QImage&,const QString&, struct passwd*) in kdm/kfrontend/kgreeter.cpp. User's real name is extracted on line:
  QString realname = QFile::decodeName( ps->pw_gecos );
but there should be something like:
  QTextCodec* codec = QTextCodec::codecForName(CODESET);
  QString realname = codec->toUnicode(ps->pw_gecos);
where CODESET stands for UTF-8, LATIN7, KOI8-R, etc.