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Thread: Finding information about spontaneous reboot

  1. #1
    Join Date
    Jan 2011
    Beans
    12

    Finding information about spontaneous reboot

    Good morning.

    I installed Ubuntu two years ago (10.04, I think...) and I am still a complete newbie. I'm very happy with it, but there are still lots of things I don't know how to do.

    This morning my 12.04 spontaneously rebooted while I was away for two minutes. It was displaying a full-window Firefox tab. I didn't have any other programs opened. I checked for updates after the reboot (everything looks like it is working fine), and I got asked to install 23Mb of updates.

    Where can I find information about the reboot? I used the Log Reader to read kernel.log and kernel.log1 (because I read in the Forums that it could be a thermal problem) but I haven't found any messages about 'thermal' 'temperature' 'heating' or anything similar.

    Could you please tell me where I should look? Or should I forget about it until it happens again?
    Last edited by Alqamar; August 16th, 2012 at 11:49 AM.

  2. #2
    Join Date
    Feb 2007
    Location
    Mandurah Western Australi
    Beans
    208
    Distro
    Ubuntu

    Re: Finding information about spontaneous reboot

    Do you mean your computer shuts it's self down then starts up again, or you computer starts up by it's self when switched off?
    Mine does the later, but it happens regardless of distro, I think it must be something to do with the hardware.

  3. #3
    Join Date
    May 2007
    Location
    Virginia, USA
    Beans
    13,259
    Distro
    Ubuntu Mate Development Release

    Re: Finding information about spontaneous reboot

    Kernel bugs were introduced in recent kernel version that can lead to overheating in laptops. If yours is a laptop and is overheating, that's most likely the reason it's shutting down.
    Ubuntu 17.04 Mate, Mint 18.1 Mate; MS Win 8.1, MS Win10 Pro.
    Will not respond to PM requests for support -- use the forums.

  4. #4
    Join Date
    Jan 2011
    Beans
    12

    Re: Finding information about spontaneous reboot

    Thanks, Marks, but my computer is a desktop.

    It didn't turn on on its own, it was working fine. Then I went away from the room for two minutes and we I came back it had rebooted itself and was showing me the login screen.

    The main problem is I don't know why it happened and I don't know where to look for more information, in case it happens again.

    Should I post complete technical specifications?

  5. #5
    Join Date
    Feb 2007
    Location
    Mandurah Western Australi
    Beans
    208
    Distro
    Ubuntu

    Re: Finding information about spontaneous reboot

    Logs are in /var/log/
    have a look at messages there's a lot of stuff in there, may be a bit of a needle in a haystack. But if you can find the exact date and time, somebody here may be able to decipher the info.

  6. #6
    Join Date
    Nov 2007
    Location
    New Zealand
    Beans
    1,224
    Distro
    Ubuntu Development Release

    Re: Finding information about spontaneous reboot

    Quote Originally Posted by Alqamar View Post
    Thanks, Marks, but my computer is a desktop.

    It didn't turn on on its own, it was working fine. Then I went away from the room for two minutes and we I came back it had rebooted itself and was showing me the login screen.

    The main problem is I don't know why it happened and I don't know where to look for more information, in case it happens again.

    Should I post complete technical specifications?
    Have you eliminated the simple explanations ?
    1) You had a power outage perhaps ...?
    2) You returned to the lock screen of the screen-saver...? that asks for your password if configured so, (and you are assuming a reboot.)

    Generally the default setting of bios is to stay powered down in the event of some power glitch causing loss of power.
    So #2 seems more likely.
    Step away from the keyboard for the same length of time as before and don't leave the room..

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