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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1421455 Title: Slow wake up time on physical power button pressed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1421455/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
