hi,
like oswald 1st comment, i think this is kde bug #98154:
> kdm doesn't take GreetString in Theme mode. the GreetString defined in
> kdmrc is not used if you set UseTheme=true. it is hardcoded in
> kdmlabel.cpp:
> { "welcome-label", I18N_NOOP("Welcome to %h") }, // _greetString
cheers,
Fathi