When installing one of the latest development builds of KDE4 on OpenSolaris (2009.06), there's a number of changes to do to make the use of the desktop more convenient.
Is disabled in a fresh installation. Execute
gnome-appearance-properties and select some better option in Fonts.
Tracked as 184465. xlock can be used as a workaround. It could also be convenient to undefine the Ctrl+Alt+L shortcut and use
System Settings -> Input Actions to redefine this shortcut to xlock.