I've just installed 15.10 on a new Dell Inspiron 13 7000 Series, after two catastrophic Hibernate crashes (needing OS reinstalls) on Trusty (14.04) over the last 3 days.

At this time, neither Suspend nor Hibernate work.

My /proc/acpi/wakeup has all entries disabled (except LID0, which is enabled).

Any help would be appreciated. Thanks in advance.



I seemed to have solved the suspend problem by getting into the BIOS at boot time (Setup) and disabling three USB-related settings.

It is likely that just one of the three is sufficient for Suspend to work, but I haven't tried to figure out which one.


  • can you specify in answer which are those usb settings? – Edward Torvalds Nov 13 '15 at 13:10
  • btw, you dont need to sign (s1b) we can see your name on the bottom right :-) – Edward Torvalds Nov 13 '15 at 13:11

Unfortunately, the problem has returned yesterday (after several days of having no problems) after I installed a QT-based application.

The behaviour now is rather strange. While the 'Suspend' system menu item puts the laptop to sleep, it returns after a few seconds. However, if I close the lid, the laptop suspends correctly. The laptop does not automatically resume when the laptop lid is opened, and requires the power switch to be pressed for a few seconds.

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