It used to work fine: I would close the lid and Ubuntu would nicely suspend and resume when I opened the lid.

Now I find that it does not. What happens first, I don't know, but on reopening the lid, the computer boots up as if from a cold start. The same thing happens when I run sudo pm-suspend, so it has nothing to do with the lid settings--it's just that the suspend command seems to simply reboot.

I have been messing with libinput around the time when it happened, installing and uninstalling it and alternating with the synaptics driver, but I'm unsure if this is related.

  • OS ver: Linux kernel 4.10.0-28-generic #32~16.04.2-Ubuntu
  • System: Dell XPS 13 9350 (late 2015), i7 Skylake processor.

Similar model (Dell XPS 15 9550), same problem. Updating the BIOS to version 1.2.29 fixed this.

For future reference:

You can easily install BIOS updates on Debian using the package fwupdmgr.


Well just as I finally decided to Ask Ubuntu, it stopped happening of course. Unsure what I did, but I followed some guidance from other, similar questions. One of which was to do a full poweroff (shut down, and restart with power button), rather than reboots. The other was to run another sudo apt dist-upgrade which seemed to also update some kernel headers.

  • Please delete the question, as the problem fixed itself and you are not sure what exactly solved the problem. – user68186 Aug 2 '17 at 16:39
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    I worry that this might get me blocked. It may also be a guideline for others. – bluppfisk Aug 2 '17 at 16:44
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    I already flagged it as "a problem that went away and can't be reproduced". What probably happened was an update that solved it. Always fully update after installing. – user692175 Aug 2 '17 at 18:04
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    In fact, I had. I just went and did it again. It most certainly did not work for a week. I didn't think kernel headers would be updated weekly, anyway I'm not sure where to find information about the recent kernel updates – bluppfisk Aug 3 '17 at 6:54
  • the issue just started happening again (yesterday) and I don't seem to have updated any headers recently. – bluppfisk Sep 3 '17 at 7:01

It's very strange and it may have worked only for me, but whenever this happens to me, I shut down the computer entirely (power off). Upon restarting, the computer suspends/resumes normally.

I read this somewhere else but cannot find the source again.

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