This seems to have gone away.
** Changed in: gnome-power-manager (Ubuntu)
Status: New = Invalid
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Login dialog missing when resuming from suspend
https://bugs.launchpad.net/bugs/541901
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Desktop Bugs, which is
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/41292627/Dependencies.txt
** Attachment added: DevkitPower.txt
http://launchpadlibrarian.net/41292628/DevkitPower.txt
** Attachment added: GConfNonDefault.txt
http://launchpadlibrarian.net/41292629/GConfNonDefault.txt