Laptop shuts down but keeps turning back on after Ubuntu shutdown [closed]

Question

I have a Lenovo IdeaPad Z570 with Ubuntu 12.04 and Windows 7. If it matters, I have a secondary NVIDIA GPU which I use Bumblebee with Primus to control (in the absence of Optimus drivers for Linux).

Every time I power down my computer from Ubuntu, it turns completely off (the shutdown process proceeds as usual and all of the lights and display turn entirely off). Then, after a few seconds, it powers back on from the very start (as if I had pressed the power button). Running 'sudo shutdown -h now' does not help. I'm asking this in Ask Ubuntu because this only occurs from my Ubuntu installation - Windows 7 does not exhibit this error.

If it matters, I recently migrated my Windows installation from a HDD to a new SSD and reinstalled Ubuntu from scratch (minus some documents in my /home directory). Any ideas?

EDIT: I believe this only happens on battery power, as I don't remember it ever happening on AC (it happens 100% right now). I don't have access to a charger at the moment, but I will try disabling laptop-mode to see if it helps.

EDIT: Setting ENABLE_LAPTOP_MODE_TOOLS=0 in /etc/laptop-mode/laptop-mode.conf seems to solve this problem, so it appears to be an issue with laptop-mode. But I'd like to maximize battery, so what can I do to fix this while keeping laptop-mode? The following errors show when I try to shutdown with laptop mode enabled - (using sudo shutdown now so I can read them without it powering off):

* Disabling laptop mode...
/lib/init/upstart-job: 28: shift: can't shift that many
/lib/init/upstart-job: 28: shift: can't shift that many
modem-manager[3415]: <info> ModemManager (version 0.5.2.0) starting...
modem-manager[3415]: Could not get the system bus. Make sure the message bus daemon is running! Message: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory

It repeats the bottom two three times with [3415], [3427], [3431]. After the final message it states [fail] in red on the right side and

*Will now switch to single-user mode

Answer 1

You may want to specify for the computer to power off after halting. Fire your favorite terminal and try this:

sudo shutdown -hP now

This should halt (h) your computer and power (P) it down.

Answer 2

After some extensive trial and error I managed to find the source of my problem. It was a specific module employed by laptop-mode-tools that was causing the issue. If the module in /etc/laptop-mode/conf.d labelled "runtime-pm.conf" is enabled or set to auto-enable (and the setting to automatically enable it in laptop-mode.conf is equal to 1) then this error occurs (basically, if the runtime-pm module is active on shutdown). Otherwise, it works fine.

I set this module never to enable and the rest are automatic, and it seems to be working fine. Knowing the specifics, I was able to conduct a more fruitful Google search and find people experiencing the exact same problem here.

Anyone experiencing this problem may be able to fix it by:

gksu gedit /etc/laptop-mode/conf.d/runtime-pm.conf

and changing CONTROL_RUNTIME_PM from "auto" or "1" to "0". This module will not be activated when laptop-mode is from now on, so after restarting it should be off and the shutdown error will not persist.

In addition, the errors I receive when I issue 'sudo shutdown' in the terminal seem to be unrelated to the issue.