No way to lock screen after sleep

[Arne Caspari]

There seems to be no way to configure GNOME to lock the screen and ask for a
password when the computer is suspended.

This is a very important security issue! After sleep a possible attacker should
need to reboot the machine if he does not have the password so that all
encrypted filesystems are no longer accessible.

[Daniel Holbach (dholbach)]

Thanks for the report. Did you try System -> Preferences -> Screensaver?

[Oliver Grawert (ogra)]

gnome-screensaver is not yet supported in ubuntu, its not integrated with the
hibernate and suspend functions of acpi-suport please use xscreensaver (the
default dependency of ubuntu-desktop)

[Arne Caspari (arne-datafloater)]

Also with xscreensaver, I only see a way to lock the screen after x minutes. But
this is not what the required functionality: even if I close the lid only for 1
minute, I would expect that a password is required after opening the lid again.

Is it possible that I do not see this because I am working on an iBook and the
lid is not controlled via ACPI?

[Oliver Grawert (ogra)]

there is no option to adjus this setting, acpi-support is locking the screen
automatically... due to architectural differences, that doesnt work with
gnome-screensaver yet. both packages clash if they are installed, make sure you
only have installed either one of them, else it might not work...

[Reinhard Tartler (siretart)]

in the meantime, it is possible to lock the screen after suspend, iff the checkbox is enabled in the screensaver preferences.

The problem for me is that this does not work reliable, but this is perhaps another bug.

[Reinhard Tartler (siretart)]

current gnome-screensaver do lock the screen. I think this bug is fixed, but feel free to reopen if you still experience problems

[Joolz (joolz)]

after upgrading breezy to dapper on one of three machines gnome-screensaver will not activate. Not after the timeout and not when invoked explicitly (lock screen). For me this is a major issue since at my work mostly i have several root terminals to servers open and need to lock the workstation when i leave for a moment.