No, I am no longer seeing this in Natty, marking as invalid.
** Changed in: gnome-screensaver (Ubuntu)
Status: Incomplete = Invalid
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I have this as well. I can clear the keyboard lock by rotating the
compiz cube by mouse clicking on the display applet.
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After unlocking screen, keyboard input is not recognised by X
https://bugs.launchpad.net/bugs/583214
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** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/48801150/Dependencies.txt
** Attachment added: GconfGnomeLockdown.txt
http://launchpadlibrarian.net/48801151/GconfGnomeLockdown.txt
** Attachment added: GconfGnomePowerManager.txt