Some recent tablets don't know how to sleep. I know, this is crazy. Instead they are designed to take frequent naps, interleaved with checking on "stuff". Kind of like a smart phone. This feature was called "Connected Standby" by Microsoft but is now called "InstantGo". <https://en.wikipedia.org/wiki/InstantGo> Linux has no support for InstantGo and PCs with it have no support for Sleep or Hiberate power states. Example machines: Mirosoft Surface Pro machines and Dell's Venue 11 Pro. I'm typing this on a Venue 11 Pro (model 1140) running Fedora 25. That's how come I've learned this. The best work around has been to add a file /etc/systemd/sleep.conf with this (not indented): # see https://bugzilla.kernel.org/show_bug.cgi?id=102281#c56 [Sleep] SuspendState=freeze Freezing isn't as good at saving power as Sleeping, but it will do. I think that this was the only painful discovery I've made so far while setting up Linux on the Venue 11 Pro.