Just took a look on the KDE bug site, and this has been reported. If you set the power management pref to turn the screen off BEFORE the screensaver blanks the screen (and locks it), then everything works!
-- Laptop LCD screen does not turn off when inactive in Kubuntu 8.10 https://bugs.launchpad.net/bugs/293603 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs