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This is an incomplete but living specification on how Ubuntu sessions should work.

As a temporary measure until ExitStrategy is implemented, there should be separate Log Out, Sleep, Hibernate, Restart, and Switch Off commands. The Log Out, Restart, and Switch Off commands should have confirmation alerts. The “Sleep” and “Switch Off” terminology should be used consistently across Ubuntu.

Packages affected: gdm, gnome-power-manager, gnome-session, indicator-session

Scope

For each of

• {start up, log in with password, log in automatically, lock screen manually, lock screen automatically, unlock, switch user account, log out, suspend, hibernate, restart, shut down},

we should define how that function is made available (or not), looks, behaves, and fails gracefully, for

• {a standard user account, an admin account, a guest session, a live/test-drive session}.

Bugs that this specification should describe fixes for:

• Bug 833290: No indication that lock screen is suppressed

Common alert elements

The primary action button should respond to the Enter key, and should not have any other access key. The Cancel button should respond to the Esc key, and should not have any other access key. None of the buttons should have icons.

Log Out

If updates that require a restart are waiting to be installed:

The “Restart” button should have the access key R. If you do not have permission to restart without authenticating, the button label should end with an ellipsis.

Otherwise:

Restart

If you do not have permission to restart without authenticating, the button label should end with an ellipsis.

Switch Off

(The phrase “shut down” is used here in the primary text as a hint for people who are used to “shut down” from previous versions or other OSes.)

If you do not have permission to switch off without authenticating, the button label should end with an ellipsis.

When suspending or hibernating fails

There are three errors Ubuntu might receive when trying to suspend or hibernate.

Not enough swap space to hibernate

Swap space is encrypted

If you have encrypted swap but have not specified a password for the swap, you would not be able to wake from hibernate. To protect you from this, Ubuntu will not hibernate in the first place. In this case, "Hibernate" should not appear in the session menu in the first place.

In the unlikely event that Ubuntu does try to hibernate in this situation ...

Sleep has already been requested

Show nothing extra, because the sleep is happening anyway.

Implementation plan

1. In indicator-session, implement the new alerts.

2. In gdm, change “Suspend” to “Sleep” and “Shut Down” to “Switch Off”.

3. In gnome-power-manager, change “Suspend” to “Sleep” and “Shutdown” [sic] to “Switch Off”.

4. In gnome-session’s behemoth dialog, change “Suspend” to “Sleep” and “Shut Down” to “Switch Off”.

5. In gnome-session, change “System policy prevents stopping the system when other users are logged in” to “To switch off the computer while others are logged in, you need to authenticate.” (with a period).

6. In gnome-user-guide, change the “Ending a Session” page so that it refers to “Switch Off” instead of “Shut Down”, and has a bullet point for “Sleep” instead of wibbling about some vendors letting you suspend.

7. Later, move the confirmation alerts from indicator-session to gnome-session.