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[TJ <ubuntu@xxxxxx>]

** Attachment added: "syslog showing the system seems to remain awake"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1576571/+attachment/4651194/+files/syslog

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https://bugs.launchpad.net/bugs/1576571

Title:
  S3 suspend resume cycle every 30 minutes

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  16.04 amd64  on an Asus T300 CHI.

  I commanded the PC to S3 suspend around 21:30 last evening. Returned
  to the PC around 08:00 this morning and discovered the PC wouldn't
  resume from suspend and had fully discharged its battery.

  After a cold boot restart I investigated the logs and noticed that
  overnight the PC appears to have been in a cycle of suspend/resume
  every 30 minutes until around 06:49 when it wrote a hibernation image,
  suspended, woke, and ran out of power.

  Due to the timestamps in kern.log not being accurate (some resume
  messages are timestamped with the suspend time until the system clock
  is corrected) its proving hard to understand the precise sequence of
  events, and even whether the PC truly did go into S3 suspend.

  The battery was fully charged before the PC was commanded to suspend
  and when running idle should last ~6 hours or more.

  I wondered about some ACPI interrupts waking it up but it has very few
  devices that might do that. It has a single USB3 port and no device
  was connected. It only has an iwlwifi PCI network device (no wired
  Ethernet). ethtool indicates there is no WoL for the WiFi  adapter. It
  only has a Bluetooth connected keyboard so there is no possibility of
  a keyboard wakeup.

  It has a touchscreen digitizer but nothing entered the room during the
  night an there are no secret stray cats, or mice!

  It does have IIO sensors for ambient light and accelerometer but there
  is currently no software accessing them although the kernel drivers
  are loaded.

  $ grep -Ea 'PM: (Prepar|Finish)' kern.log
  Apr 28 21:36:54 T300CHI kernel: [82469.274147] PM: Preparing system for sleep (mem)
  Apr 28 21:36:54 T300CHI kernel: [82471.096890] PM: Finishing wakeup.
  Apr 28 21:37:31 T300CHI kernel: [82507.808915] PM: Preparing system for sleep (mem)
  Apr 28 21:37:35 T300CHI kernel: [82509.203304] PM: Finishing wakeup.
  Apr 28 22:07:45 T300CHI kernel: [84319.706320] PM: Preparing system for sleep (mem)
  Apr 28 22:07:49 T300CHI kernel: [84321.104263] PM: Finishing wakeup.
  Apr 28 22:38:01 T300CHI kernel: [86131.634214] PM: Preparing system for sleep (mem)
  Apr 28 22:38:04 T300CHI kernel: [86133.021188] PM: Finishing wakeup.
  Apr 28 23:08:19 T300CHI kernel: [87943.507350] PM: Preparing system for sleep (mem)
  Apr 28 23:08:19 T300CHI kernel: [87944.923894] PM: Finishing wakeup.
  Apr 28 23:38:34 T300CHI kernel: [89755.366961] PM: Preparing system for sleep (mem)
  Apr 28 23:38:34 T300CHI kernel: [89756.786890] PM: Finishing wakeup.
  Apr 29 00:08:48 T300CHI kernel: [91567.020044] PM: Preparing system for sleep (mem)
  Apr 29 00:08:48 T300CHI kernel: [91568.436456] PM: Finishing wakeup.
  Apr 29 00:38:59 T300CHI kernel: [93378.844871] PM: Preparing system for sleep (mem)
  Apr 29 00:39:03 T300CHI kernel: [93380.256574] PM: Finishing wakeup.
  Apr 29 01:09:13 T300CHI kernel: [95190.641618] PM: Preparing system for sleep (mem)
  Apr 29 01:09:17 T300CHI kernel: [95192.030272] PM: Finishing wakeup.
  Apr 29 01:39:28 T300CHI kernel: [97002.442841] PM: Preparing system for sleep (mem)
  Apr 29 01:39:32 T300CHI kernel: [97003.826499] PM: Finishing wakeup.
  Apr 29 02:09:42 T300CHI kernel: [98814.281002] PM: Preparing system for sleep (mem)
  Apr 29 02:09:46 T300CHI kernel: [98815.670863] PM: Finishing wakeup.
  Apr 29 02:40:01 T300CHI kernel: [100626.106115] PM: Preparing system for sleep (mem)
  Apr 29 02:40:01 T300CHI kernel: [100627.499669] PM: Finishing wakeup.
  Apr 29 03:10:11 T300CHI kernel: [102437.773451] PM: Preparing system for sleep (mem)
  Apr 29 03:10:15 T300CHI kernel: [102439.159921] PM: Finishing wakeup.
  Apr 29 03:40:30 T300CHI kernel: [104249.563211] PM: Preparing system for sleep (mem)
  Apr 29 03:40:30 T300CHI kernel: [104250.977264] PM: Finishing wakeup.
  Apr 29 04:10:44 T300CHI kernel: [106061.409233] PM: Preparing system for sleep (mem)
  Apr 29 04:10:44 T300CHI kernel: [106062.798963] PM: Finishing wakeup.
  Apr 29 04:40:59 T300CHI kernel: [107873.214783] PM: Preparing system for sleep (mem)
  Apr 29 04:40:59 T300CHI kernel: [107874.612422] PM: Finishing wakeup.
  Apr 29 05:11:09 T300CHI kernel: [109684.937138] PM: Preparing system for sleep (mem)
  Apr 29 05:11:13 T300CHI kernel: [109686.330386] PM: Finishing wakeup.
  Apr 29 05:41:28 T300CHI kernel: [111496.747318] PM: Preparing system for sleep (mem)
  Apr 29 05:41:28 T300CHI kernel: [111498.140735] PM: Finishing wakeup.
  Apr 29 06:11:29 T300CHI kernel: [113298.690266] PM: Preparing system for sleep (mem)
  Apr 29 06:11:33 T300CHI kernel: [113300.102234] PM: Finishing wakeup.
  Apr 29 06:41:34 T300CHI kernel: [115101.410436] PM: Preparing system for sleep (mem)
  Apr 29 06:41:38 T300CHI kernel: [115102.820245] PM: Finishing wakeup.

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