Before, with Gnome 2, I've configured it for when I close the laptop lid it lock the screen demanding the password. It's because sometimes I go to any places publics or with my friends and I don't want to have the PC trolled when I leave it for a while.
Now, with Ubuntu 11.10, the gnome-screensaver is deleted, so when I select the "blank" option at "org.gnome.settings-daemon.plugins.power lid-close-ac-action" with dconf-editor, only it puts the screen black, but it doesn't block the screen because before the gnome-screensaver was the responsible of doing it and with Gnome 3 and Unity it dissapears.
It's possible to add and "lock-screen" option that executes the lock screen command? Because I think that to close the screen is a better gesture to make sure that you've locked it more than remember always to do Ctrl+Alt+L.
See also bug 888330, the equivalent for blanking the screen.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-power-manager 3.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
Date: Sun Oct 9 02:08:57 2011
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GnomeSessionSuspendInhibited: No
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20111006)
MachineType: Dell Inc. XPS M1330
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=f2473a46-a5f1-46b1-8b14-e6677563f14b ro quiet splash nomodeset video=uvesafb:mode_option=1280x1024-24,mtrr=3,scroll=ywrap vt.handoff=7
SourcePackage: gnome-power-manager
UpgradeStatus: Upgraded to oneiric on 2011-10-07 (1 days ago)
dmi.bios.date: 12/26/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 0U8042
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA15:bd12/26/2008:svnDellInc.:pnXPSM1330:pvr:rvnDellInc.:rn0U8042:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: XPS M1330
dmi.sys.vendor: Dell Inc.
gnome-power-bugreport: Error: [Errno 2] No existe el archivo o el directorio
Status changed to 'Confirmed' because the bug affects multiple users.