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[b3nmore <1349879@xxxxxxxxxxxxxxxxxx>]

I did some further testing with following results: I can reestablish the
correct suspend behavior by plugging in the drive, mounting, unmounting
and unplugging the drive without powering down. This has to be done on
exactly the same port, which triggered the misbehavior (other ports will
not work).

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https://bugs.launchpad.net/bugs/1349879

Title:
  powering off an usb3 device causes kernel to resume immediately after
  suspend

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After powering off an usb3 disk (e.g. udisksctl power-off -b /dev/sdc)
  the system immediately resumes after suspend. This does not happen, if
  I umount the device and disconnect it. Usb devices < 3.0 seem not to
  be affected.

  How to reproduce:
  1) plug an usb3 device to an usb3 port and mount it
  2) umount it
  3) power it off: udisksctl power-off -b /dev/sdX
  4) suspend: (e.g. echo mem > /sys/power/state)

  result: system suspends and immediately resumes

  Package: udisks2 (2.1.3-1)

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