Unlocking screensaver is not possible using any key on keyboard. Need to use a mouse klick on cashew nut and choose "unlock screensaver" to get password dialog. This happens only, if in kde systemsettings the screensaver option "widgets on screen saver" is selected. Regardless if any widget is configured. Seen in KDE 4.10.0 and in KDE 4.10.1. This is not a duplicate of https://bugs.kde.org/show_bug.cgi?id=313587 Reproducible: Always Steps to Reproduce: 1. Select systemsettings screensaver: "widgets on screensaver". 2. Wait until screensaver gets active. 3a. Press any key on keyboard: nothing happens. 3b. Use mouse, click cashew nut, select to unlock screen saver. Then you are able to enter password. Actual Results: Mouse required to unlock screensaver. Expected Results: Unlock screensaver with keyboard or mouse action.
Have you tried pressing the escape key? That brings the password field up for me.
*** This bug has been marked as a duplicate of bug 313587 ***