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[Simon Raffeiner <sturmflut@xxxxxxxxxxxxxx>]

I was monitoring my syslog while pressing the button.

Apr 29 14:37:35 ubuntu-phablet powerd[949]: handle_requestSysState from :1.13 - ACTIVE (1)
Apr 29 14:37:35 ubuntu-phablet powerd[949]: name_watch_add: looking for :1.13
Apr 29 14:37:35 ubuntu-phablet powerd[949]: watching :1.13 to see when it disappears on dbus
Apr 29 14:37:35 ubuntu-phablet powerd[949]: libsuspend: acquire_wake_lock: powerd_power_request
Apr 29 14:37:35 ubuntu-phablet powerd[949]: handle_requestSysState - SUCCESS
Apr 29 14:37:35 ubuntu-phablet powerd[949]: Enqueue state change to ACTIVE
Apr 29 14:37:35 ubuntu-phablet powerd[949]: exiting suspend
Apr 29 14:37:35 ubuntu-phablet powerd[949]: libsuspend: exit_suspend.
Apr 29 14:37:35 ubuntu-phablet kernel: [21759.723201][Ker_PM][request_suspend_state]wakeup (3->0) at 21760134073325 (2015-04-29 12:37:35.882532317 UTC)

< exactly here there is a short delay>

Apr 29 14:37:36 ubuntu-phablet powerd[949]: Emitting signal for transition to state ACTIVE (1)
Apr 29 14:37:36 ubuntu-phablet powerd[949]: Transition to ACTIVE complete
Apr 29 14:37:36 ubuntu-phablet powerd[949]: libsuspend: release_wake_lock: powerd_power_request
Apr 29 14:37:36 ubuntu-phablet kernel: [21760.273491]mtk-tpd: TPD wake up
Apr 29 14:37:36 ubuntu-phablet powerd[949]: light_dev: setting brightness to 120
Apr 29 14:37:36 ubuntu-phablet kernel: [21760.310044]mtk-tpd: TPD wake up done
Apr 29 14:37:36 ubuntu-phablet kernel: [21760.310066]<MAGNETIC>  mag_context_obj ok------->hwm_obj->early_suspend=0 
Apr 29 14:37:36 ubuntu-phablet powerd[949]: we get signal from :1.13: DisplayPowerStateChange
Apr 29 14:37:36 ubuntu-phablet powerd[949]: Received DisplayPowerStateChange: state=1 flags=2


Since some of those messages are from the kernel ringbuffer, I looked at the corresponding dmesg output:

[21606.412808] [Ker_PM][request_suspend_state]wakeup (3->0) at 21606823677239 (2015-04-29 12:35:02.572136231 UTC)
[21606.953480] mtk-tpd: TPD wake up
[21606.980027] mtk-tpd: TPD wake up done

So there seems to be at least half a second of delay between the kernel
registering the button press and the display actually being requested to
power on. Since display power-on is not instant, the total time from
button press to visible display content is close to a second on my
device in best case, sometimes up to three seconds and in rare cases the
display does not turn on at all.

-- 
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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1421455

Title:
  Slow wake up time on physical power button pressed

Status in unity8 package in Ubuntu:
  Incomplete

Bug description:
  Device: bq Aquaris E4.5 running: Stable #17

  When pressing on physical power button on device to wake it up
  sometime it even takes up to 2-3 secs before anything appears on the
  screen. This time wary but its hard to tell then its shorter and when
  is longer.

  This is not so bad on nexus4.

  
  Should you need more info, I'm happy to help.

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