no reaction on shortly pressing power button

Status changed to 'Confirmed' because the bug affects multiple users.

i can confirm this happens on 32 bit ubuntu 11.10 and xubuntu 11.10 (they seem to use the same greeter).

it is anoying when a todler turns on computer but not tv screen.

also if turned on computer but not overhead projector.
you want a) avoid turn on screen and b) avoid "hard" shutdown.

I experience this bug in 11.10 + updates for AMD64. There are other sightings on the web:
 <https://lists.ubuntu.com/archives/ubuntu-uk/2011-December/032588.html>
 <https://forums.virtualbox.org/viewtopic.php?f=3&t=46554>

I don't know if this is a unity-greeter bug or a bug in acpid's /etc/acpi/powerbtn.sh

It looks to me as if /etc/acpi/powerbtn.sh tries hard to find the X user to figure out what to do but that when unity-greeter is running there is no user. Mind you, /etc/acpi/powerbtn.sh ends with "if all else fails, shutdown -h now".

Before unity-greeter, this wasn't a problem.

All-in-all, I'd guess that this is a unity-greeter bug.

Why do I care? Because sometimes my computer is headless and it is awkward to shut it down cleanly without the power button functioning as it should.

See also <https://bugs.launchpad.net/lightdm-gtk-greeter/+bug/792242> "power button shuts down immediatly (no warning)"

This seems to be a different manifestation of what is likely the same problem.

Confirmed under 12.04 as well.

I have a desktop with USB keyboard & mouse, and a motherboard (MSI G31M3) that intermittently (around 1 boot in 15) fails to initialise USB correctly in the BIOS. Unplugging and re-plugging USB devices doesn't help, the whole subsystem is non-functional, the only thing that works is to reboot.

For those boots when I have no functioning input device, in Ubuntu 11.04 and before, the power button on the case was my input device, because it could be pressed briefly, and the computer would then shut itself down cleanly after 60 seconds, and then I could boot again normally, and the USB problem was easily worked around. But from 11.10 onwards, this no longer works, so all I can do is a forced power-off, with resulting possible disk data corruption problems. It would be really good to have this functionality back.

guys seems that on my machine everything work now, can you control on yours?

> on my machine everything work now, can you control on yours?
No, it's still present as a problem in Ubuntu 13.04 Raring. Pressing the power button _after_ logging in will bring up the shutdown dialog - but at the greeter/login screen, pressing the power button still does nothing, so it's still an issue.

Fixed in trunk:
http://bazaar.launchpad.net/~unity-greeter-team/unity-greeter/trunk/revision/1013

This bug was fixed in the package unity-greeter - 14.04.0-0ubuntu1

---------------
unity-greeter (14.04.0-0ubuntu1) trusty; urgency=low

  * New upstream release:
    - Use Unity style shutdown dialogs (LP: #857577)
    - Handle hardware power button in greeter (LP: #903306)
    - Use an Upstart process to start indicator services (LP: #1185565)
    - Fix build with Vala 0.22
    - Clean up compile warnings
 -- Robert Ancell <email address hidden> Mon, 11 Nov 2013 17:16:17 +1300