An interesting snippet from the syslog:
// Suspend
Oct 4 18:14:26 ubuntu-phablet kernel: [20994.425695] suspend: enter suspend
Oct 4 18:14:26 ubuntu-phablet kernel: [20994.425756] PM: suspend entry
2016-10-04 16:14:26.176861138 UTC
Oct 4 18:14:26 ubuntu-phablet kernel: [20994.425878] PM: Syncing filesystems...
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.507337] Freezing user space
processes ... (elapsed 0.001 seconds) done.
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.526535] sync done.
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.749455] Freezing remaining
freezable tasks ... (elapsed 0.003 seconds) done.
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.752782] Suspending console(s)
(use no_console_suspend to debug)
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.764166] msm_fb_ext_suspend:
Turning off HPD circuitry
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.803446] PM: suspend of devices
complete after 46.878 msecs
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.805216] PM: late suspend of
devices complete after 1.739 msecs
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.808878] active wake lock
alarm_rtc, time left 96
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.808909] power_suspend_late return
-11
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.808970] dpm_run_callback():
power_suspend_late+0x0/0x68 returns -11
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.809031] PM: Device power.0 failed
to suspend noirq: error -11
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.811290] PM: noirq resume of
devices complete after 2.227 msecs
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.814952] PM: early suspend of
devices complete after 1.739 msecs
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.814983] PM: Some devices failed
to power down
// Immediately resume
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.821575] msm_fb_ext_resume:
Turning on HPD circuitry
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.827496] PM: resume of devices
complete after 12.482 msecs
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.829022] Restarting tasks ... done.
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.869919] PM: suspend exit
2016-10-04 16:14:27.047214477 UTC
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.869950] suspend: exit suspend,
ret = -11 (2016-10-04 16:14:27.047214477 UTC)
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.869950] active wake lock
alarm_rtc, time left 89
Oct 4 18:14:27 ubuntu-phablet kernel: [20994.869950] suspend: abort suspend
Oct 4 18:14:27 ubuntu-phablet kernel: [20995.761511] wake lock alarm_rtc,
expired
... and this is going on continuously while the phone is idle. The phone
suspends but it immediately wakes up, seemingly because a very short
alarm is set ("active wake lock alarm_rtc, time left XX", XX is in
milliseconds), then it suspends again, and wakes up again immediately,
and so on. I don't know who is setting this alarm.
https://bugs.launchpad.net/ubuntu-power-consumption/+bug/1603024 could
be related.
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https://bugs.launchpad.net/bugs/1630382
Title:
Awful life battery since OTA 13
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