The useful piece from the log:

Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] client.c: Created 7 "Native client (UNIX socket client)"
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-dbus.c: Interface org.PulseAudio.Core1.Client added for object /org/pulseaudio/core1/client7
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-native.c: Protocol version: remote 28, local 28
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-native.c: Got credentials: uid=32011 gid=32011 success=1
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-native.c: SHM possible: yes
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-native.c: Negotiated SHM: yes
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] module-augment-properties.c: Looking for .desktop file for pactl
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-dbus.c: Interface org.PulseAudio.Core1.Device removed from object /org/pulseaudio/core1/sink2
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-dbus.c: Interface org.PulseAudio.Core1.Sink removed from object /org/pulseaudio/core1/sink2
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-dbus.c: Interface org.PulseAudio.Core1.DevicePort removed from object /org/pulseaudio/core1/sink2/port0
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] module-suspend-on-idle.c: Sink bluez_sink.00_21_CC_E9_02_39 becomes idle, timeout in 5 seconds.
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [bluetooth] sink.c: Requesting rewind due to started move
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-native.c: Requested tlength=250,00 ms, minreq=20,00 ms
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-native.c: Traditional mode enabled, modifying sink usec only for compat with minreq.
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-native.c: Requested latency=210,00 ms, Received latency=210,00 ms
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] sink-input.c: Successfully moved sink input 0 to sink.primary.
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] module-rescue-streams.c: Successfully moved sink input 0 "QtPulseAudio:2505" to sink.primary.
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-dbus.c: Interface org.PulseAudio.Core1.Device removed from object /org/pulseaudio/core1/source4
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-dbus.c: Interface org.PulseAudio.Core1.Source removed from object /org/pulseaudio/core1/source4
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] module-rescue-streams.c: No source outputs to move away.
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [bluetooth] module-bluetooth-device.c: IO thread shutdown requested, stopping cleanly
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [bluetooth] module-bluetooth-device.c: IO thread shutting down
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] module-bluetooth-device.c: Acquiring transport /org/bluez/859/hci0/dev_00_21_CC_E9_02_39/fd0
Feb 18 17:16:02 ubuntu-phablet bluetoothd[859]: audio/telephony.c:handle_network_property_changed() in handle_registration_property_changed(), the property is Strength
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_transport_acquire() Transport /org/bluez/859/hci0/dev_00_21_CC_E9_02_39/fd0: read lock acquired
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_transport_acquire() Transport /org/bluez/859/hci0/dev_00_21_CC_E9_02_39/fd0: write lock acquired
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_owner_create() Owner created: sender=:1.46 accesstype=rw
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/headset.c:headset_set_state() State changed /org/bluez/859/hci0/dev_00_21_CC_E9_02_39: HEADSET_STATE_CONNECTED -> HEADSET_STATE_PLAY_IN_PROGRESS
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/media.c:headset_state_changed() 
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_request_create() Request created: method=Acquire id=1
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_owner_add() Owner :1.46 Request Acquire
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_transport_add() Transport /org/bluez/859/hci0/dev_00_21_CC_E9_02_39/fd0 Owner :1.46
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: Operation not supported (95)
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_transport_remove() Transport /org/bluez/859/hci0/dev_00_21_CC_E9_02_39/fd0 Owner :1.46
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_transport_release() Transport /org/bluez/859/hci0/dev_00_21_CC_E9_02_39/fd0: read lock released
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_transport_release() Transport /org/bluez/859/hci0/dev_00_21_CC_E9_02_39/fd0: write lock released
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_request_reply() Request Acquire Reply Input/output error
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_owner_free() Owner :1.46
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/transport.c:media_owner_remove() Owner :1.46 Request Acquire
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/headset.c:headset_set_state() State changed /org/bluez/859/hci0/dev_00_21_CC_E9_02_39: HEADSET_STATE_PLAY_IN_PROGRESS -> HEADSET_STATE_CONNECTED
Feb 18 17:16:19 ubuntu-phablet bluetoothd[859]: audio/media.c:headset_state_changed() 
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] module-bluetooth-device.c: Failed to acquire transport /org/bluez/859/hci0/dev_00_21_CC_E9_02_39/fd0
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] card.c: Changed profile of card 1 "bluez_card.00_21_CC_E9_02_39" to off
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] sink.c: Freeing sink 2 "bluez_sink.00_21_CC_E9_02_39"
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] source.c: Freeing source 4 "bluez_sink.00_21_CC_E9_02_39.monitor"
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] client.c: Freed 7 "pactl"
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-native.c: Connection died.
Feb 18 17:16:19 ubuntu-phablet pulseaudio[2122]: [pulseaudio] protocol-dbus.c: Interface org.PulseAudio.Core1.Client removed from object /org/pulseaudio/core1/client7
Feb 18 17:16:21 ubuntu-phablet kernel: [  141.921824][Ker_PM][request_suspend_state]sleep (0->3) at 141922562834 (2015-02-18 17:16:21.634153062 UTC)
Feb 18 17:16:21 ubuntu-phablet kernel: [  141.921856][Ker_PM][request_suspend_state]sys_sync_work_queue early_sys_sync_work
Feb 18 17:16:21 ubuntu-phablet kernel: [  141.921882][Ker_PM][request_suspend_state]suspend_work_queue early_suspend_work
Feb 18 17:16:21 ubuntu-phablet kernel: [  141.949405]<MAGNETIC>  mag_context_obj ok------->hwm_obj->early_suspend=1 
Feb 18 17:16:21 ubuntu-phablet kernel: [  141.949420]mtk-tpd: TPD enter sleep
Feb 18 17:16:21 ubuntu-phablet kernel: [  141.957520]mmc3516x: set power mode ok 0!
Feb 18 17:16:21 ubuntu-phablet kernel: [  141.957542][LED]#6:0
Feb 18 17:16:22 ubuntu-phablet kernel: [  142.566474][Ker_PM][early_suspend]calling pm_autosleep_set_state() with parameter: 3
Feb 18 17:16:22 ubuntu-phablet kernel: [  142.566549]active wakeup source: USB suspend lock
Feb 18 17:16:22 ubuntu-phablet kernel: [  142.566560]active wakeup source: battery suspend wakelock
Feb 18 17:16:22 ubuntu-phablet kernel: [  142.566570]active wakeup source: pmicAuxadc irq wakelock