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[god <1454253@xxxxxxxxxxxxxxxxxx>]

Ok, I've managed to track this down to bios setting regarding "keep
feeding electrivity to usb ports while in sleep". So apparently this is
some quirk related to failed efi firmware or acpi tables for asus ux31a
laptop.

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https://bugs.launchpad.net/bugs/1454253

Title:
  external usb breaks suspend

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After booting xubuntu 15.04 it's possible to suspend it the normal way
  BUT - only until you've plugged external usb hard drive. After that
  (even if it was unmounted and removed) it becomes impossible: the
  system goes to suspend briefly (for bout 1 second) but immediately
  wakes up for no apparent reason.

  I suspect there's some weird bug in xfce power management - is there a way to disable it alltogether and  rely on systemd directly instead?
  --- 
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 15.04
  EcryptfsInUse: Yes
  Package: linux (not installed)
  Tags:  vivid
  Uname: Linux 4.1.0-040100rc6-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip fax floppy fuse kismet libvirtd lpadmin netdev plugdev sambashare scanner sudo tape video wireshark
  _MarkForUpload: True
  --- 
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 15.04
  EcryptfsInUse: Yes
  Package: linux (not installed)
  Tags:  vivid
  Uname: Linux 4.1.0-040100rc6-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip fax floppy fuse kismet libvirtd lpadmin netdev plugdev sambashare scanner sudo tape video wireshark
  _MarkForUpload: True

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