Some additional requests.  Can you review your BIOS settings to see if
there is an automatic wakeup set there?

Also, is the system waking up 24 hours from the time it is suspended, or
does it wakeup at the same time of day?  Just trying to see if an
external USB device is waking it at a specific time.

One last thing, the Firmware Test Suite can dump some CMOS data to see
if wakeup is set.  If possible, can you install fwts and run the
following:

sudo fwts cmosdump

Then attach the output.

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https://bugs.launchpad.net/bugs/1318477

Title:
  XPS 15 9530 wakes from sleep after exactly 24 hours + 3-5 seconds

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