Ubuntu 14.04LTS. Set to suspend when lid closed.

Mostly it works - often I can use it for a week, suspending and resuming with no problems. But sometimes something changes and it stops working: shutting the lid will do nothing - the machine keeps running.

If the fan comes on then I know it has happened. Otherwise the first I know about it is when I open it the next day and the battery is completely flat, or if I open the lid a short while later and notice it's still running.

Rebooting always solves it - meaning that it will now suspend and resume happily again - but I have not found any less severe way to recover the situation. I also don't know what to do to force the problem.

I have found many questions about suspend not working at all - but that's not the problem here.

Is there anything I can do to diagnose please?


1 Answer 1


I'm having a similar issue. I didn't identify the source yet, but here's what I did

1-Ran dmesg and captured the time of the last event. 2-Ran dmesg | grep "{last event time}" -A1000 to capture the lines. You should get only 1 line. 3-Closed the lid.

In my case, it tries to suspend, and it wakes up itself almost immediately.

4-Opened the lid, unlocked the screen and ran again the last dmesg with the grep.

I saw in the output the computer is going to sleep, and immediately wakes up itself, on it's own.

I guess there's something like laptop-tools or similar waking it up. I removed the USB devices as well, and it keeps waking up.

I will let you know if I manage to find the solution. I'm using a Thinkpad T430S here.


  • Thanks - that's a good suggestion, although I don't see the problem any more: a month or two ago the kernel updated to the 16.04LTS kernel and the problem hasn't happened since.
    – Mark Smith
    Nov 4, 2016 at 7:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.