Ubuntu – PC restarts after a few seconds when performing shutdown or suspend


After a shutdown or suspend, the machine appears to completely shutdown (all fans stop and are quiet), after a few seconds, everything is powered up again by itself.

Despite the many offered solutions here in the forum, my pc keeps on rebooting after shutdown and after suspend.

IMPORTANT UPDATE: it appears that the pc shuts down without restart when ZFS is performing a scrub. I assume this means that something is going wrong when the pc is shutting down with regards to ZFS (unmount? unshare ?). Any clues ?

  • I tried adding acpi=noirq to the grub file, after that I executed
  • I tried adding acpi=no apm=no instead, but that caused suspend to not terminate properly and result in a reboot. Shutdown causes reboot like before.
  • Tried sudo halt, sudo shutdown -h now
  • Tried installing laptop-mode-tools in Ubuntu 12.10
  • De-activated WOL
  • I even tried to change "auto" to "on" in the "control" files for every device.
  • Upgraded to Ubuntu 13.04 (I believe laptop-mode-tools are not available under 13.04?)
  • Tried messing in the BIOS ACPI settings (switched everything off, with no result)

None of it seems to work, and I'm getting out of info on the forum…


  • Is there anybody that has an idea what could go wrong ?
  • Could ZFS be the cause ?
  • Or the fact that I have an additional pci-e network adapter ? (some WOL issue)
  • I'm not too familiar with Ubuntu, how can I access/dump the logtext when the system is going to shutdown or suspend (not the arrow key, but a file) ?

Running Ubuntu 13.04 now, with ZFS (6 disks) as a NAS on a ASRock B75 Pro3-M, Intel Pentium G2020, 16 Gb RAM, additional pci-e network adapter.

Best Answer

I have the same issue, my case is that it happens if on a session I had run any game from steam.

I've been trying to get help from askubuntu and steam forum, no one seems to be replying yet.

No idea what is the root cause yet and I don't have ZFS. I've also tried some of the possible fix that you've tried. Too bad is that I'm still very new to the Linux world and there is not much that I can help of

This is my observation:

  1. Switch off the psu and switch on again clears the effect sometimes
  2. Otherwise, the computer needs to be powered down for a period (around half a day) to remove the effect

My system: Ubuntu 13.04, PcPartPicker

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