Power Button not working at login screen

[fmueller01]

Hi there,

being quite new to Ubuntu I encountered the following issue:

On Ubuntu 12.04.1 pressing the physical power button on the machine shuts down the pc. However, this only works if a user is logged in, i.e. there's no effect of power button presses at the login screen.

Is this the intended behavior? If yes, any way to make it shutdown at the login screen after power button press also?

Any hints are greatly appreciated. Thanks.

[androssofer]

Hi there,

being quite new to Ubuntu I encountered the following issue:

On Ubuntu 12.04.1 pressing the physical power button on the machine shuts down the pc. However, this only works if a user is logged in, i.e. there's no effect of power button presses at the login screen.

Is this the intended behavior? If yes, any way to make it shutdown at the login screen after power button press also?

Any hints are greatly appreciated. Thanks.

someone else posted something similar and got not answer..

they key would be the power settings.. and settings them for the login..

so if we could run

gnome-control-center

on login, change the settings. it would probably work..

a similar technique was used to change the login screen background on old ubuntu versions. but now it uses a different login screen managed called 'lightdm'. so the method doesnt work anymore..

[fmueller01]

Okay, so looking into lightdm might be worthwhile. Thanks for the tip.

[fmueller01]

A quick Google search led me to "http://mjg59.dreamwidth.org/2414.html", from there I get the impression that lightdm is completely separate from the desktop environment, i.e. any setting made concerning power management do not apply at the login screen (because no user session has been started yet).

So there seems to be no easy solution to this problem. That's disappointing, because my Ubuntu box runs headless and powering off with no login would be great.

Any suggestions for a workaround are greatly appreciated. Thanks.

[androssofer]

So there seems to be no easy solution to this problem. That's disappointing, because my Ubuntu box runs headless and powering off with no login would be great.

Any suggestions for a workaround are greatly appreciated. Thanks.

is it ubuntu server?

may i ask why you are trying to achieve this?

[cogier]

I looked into this and tried [Ctrl]+[Alt]+[Del] and that allows you to log out - but as you have already logged out it does nothing?!

I presume you are aware of the ability to shut down with the menu at the top right of the login screen.