Reboot after shutdown (Ubuntu 14.04 (also 12.04); Dell latitude E7440)

Question

I have a rather serious shutdown/reboot issue with my Ubuntu OS on my brand new Dell latitude E7440 netbook. The issue does not seem to depend on the OS version: it occurs with 12.04, 13.10 and now with 14.04. I've waited for the new LTS in the hope that it would solve my problem, but that is not the case.

After shutting down my ubuntu, my laptop reboots about two seconds after shutdown. I've tried many things to solve it, but none of them did the job. I have the 64 bit version of 14.04 installed and boot in legacy boot mode with secure boot disabled. The behavior is independent from a power cable/usb device/ethernet cable being plugged in. Strange enough, however, it does sometimes stay powered off after being used for several hours...

I know there have been several treats concerning shutdown/reboot issues, but none of them provides an answer to my specific case. I ran diagnostics in the BIOS to recover any potential hardware problems, but there were none. If you have an answer or even a clue on how to solve this issue, it will be highly appreciated! Thanks in advance!

Solution 1

I experienced exactly the same problem on my new computer Intel i5-4440 processor and Intel DB85FL motherboard (4th Gen). First I faced this problem with Ubuntu 13.10. and subsequently after upgrading to 14.04 LTS.

I did the following recently to solve this problem of SHUTDOWN and automatic REBOOT again withing a second or two.

I have Intel Visual BIOS. On power up I pressed F2 > POWER > Wake On LAN from S4/S5.

This has 3 options. 1. Stay Off, 2. Power on - Normal Boot, and 3. Power on - PXE Boot. My computer was set to #2, which was making it automatically REBOOT after SHUTDOWN. I now changed to #1 option mentioned above. Now it is okay.

Hope this would work for you as well. Best wishes.

Solution 2

I also faced the same case on my Acer Aspire E1-470G using Ubuntu 14.04. These steps worked for me.

1. Type in terminal

   sudo nano /etc/default/grub
   

   then find a line

   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
   

   Modify it to

   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" acpi=force apm=power_off
   

2. Type in terminal sudo nano /etc/grub/modules then add apm power_off=1 under line lp. Save and close the terminal.

3. Update the GRUB

   sudo update-grub
   

Solution 3

I had the same problem with my new intel motherboard and core i5 processor, Ubuntu 14.04.1 64bit OS. I tried to disable wakeup from LAN from bios and did not get any success.

Then I modified

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" acpi=force apm=power_off

Still no success.

One of my colleagues suggested that, though mine was a desktop PC, I should install laptop-mode-tools, and surprisingly it worked!

Comments

[Admin]

Hi fleamour. The reboot also takes place without any cable/device/monitor connected, so that is not possible.

[Admin]

In my case only happens when no power cable is connected.

[Admin]

I just discovered that only when the bluetooth receiver (USB adapter) is connected (laptop running on battery) this problem happens.

[Admin]

There seems to be a bug reported about this: bugs.launchpad.net/ubuntu/+source/linux/+bug/1346269

[Kees]

bluepearlsky, thanks a lot! I would have never been able to fix this myself. Your fix did the job! I still consider it very weird that this is needed though... In my case (Dell latitude E7440, SSD, core i7) you need to go to 'power management' in the BIOS and there are 5 options for 'wake on LAN'. Like the answer above, you need to pick `disable' from those five.

[terdon]

@Kees, if this answer solves your issue please take a minute and check the check mark under the vote count to the left, this will signify to everyone that your issue's been resolved.

[bluepearlsky]

You are welcome, Kees. I am glad you could fix the problem. Have a nice time and take care.

[lepe]

No luck for me. In my system, there is no /etc/grub/ directory, and the "modules" file is in /etc/modules.

[lepe]

I have "wake on LAN" off so it doesn't solved it for me.

[morloch]

I skipped step 2, but the problem was still resolved, thanks!

[Adrian]

I basically went into my BIOS and turned off every option with the word "wake" in it... I don't need my computer raising itself from the dead like some zombie. This was an HP zBook 15, just in case any other people are suffering with it... it turned on in my bag and overheated itself through a 90 minute drive... seems to be fixed now.