Comment 59 for bug 874535

it is strange that your headphone is plugged in at 25.567 , unplugged at 25.781 and plugged again 25.855

seem related to [pulseaudio] module-device-restore.c: Restoring mute state for sink alsa_output.pci-0000_00_14.2.analog-stereo.

( 25.567| 16.401) D: [pulseaudio] module-alsa-card.c: Jack 'Front Headphone Jack' is now plugged in
( 25.567| 0.000) D: [pulseaudio] device-port.c: Setting port analog-output-headphones to status yes
( 25.568| 0.000) D: [pulseaudio] module-switch-on-port-available.c: finding port analog-output-headphones
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Activating path analog-output-headphones
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Path analog-output-headphones (Headphones), direction=1, priority=90, probed=yes, supported=yes, has_mute=yes, has_volume=yes, has_dB=yes, min_volume=0, max_volume=64, min_dB=-179, max_dB=0
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element Master, direction=1, switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x7ffffffffffff, n_channels=1, override_map=yes
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element Headphone, direction=1, switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=4, required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element Front, direction=1, switch=1, volume=3, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x6, n_channels=2, override_map=no
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element Surround, direction=1, switch=2, volume=2, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x6, n_channels=2, override_map=no
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element Side, direction=1, switch=2, volume=2, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x6, n_channels=2, override_map=no
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element Center, direction=1, switch=2, volume=2, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x7ffffffffffff, n_channels=1, override_map=no
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element LFE, direction=1, switch=2, volume=2, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x7ffffffffffff, n_channels=1, override_map=no
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element PCM, direction=1, switch=0, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Element IEC958, direction=1, switch=2, volume=0, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x0, n_channels=0, override_map=no
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Jack Front Headphone, alsa_name='Front Headphone Jack', detection possible
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Jack Front Headphone Phantom, alsa_name='Front Headphone Phantom Jack', detection unavailable
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Jack Headphone, alsa_name='Headphone Jack', detection unavailable
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Jack Headphone Phantom, alsa_name='Headphone Phantom Jack', detection unavailable
( 25.568| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Jack Headphone Mic, alsa_name='Headphone Mic Jack', detection unavailable
( 25.569| 0.000) I: [alsa-sink-ALC892 Analog] alsa-sink.c: Successfully enabled deferred volume.
( 25.569| 0.000) I: [alsa-sink-ALC892 Analog] alsa-sink.c: Hardware volume ranges from -179.00 dB to 0.00 dB.
( 25.569| 0.000) I: [alsa-sink-ALC892 Analog] alsa-sink.c: Fixing base volume to 0.00 dB
( 25.569| 0.000) I: [alsa-sink-ALC892 Analog] alsa-sink.c: Using hardware volume control. Hardware dB scale supported.
( 25.569| 0.000) I: [alsa-sink-ALC892 Analog] alsa-sink.c: Using hardware mute control.
( 25.569| 0.000) I: [pulseaudio] sink.c: Changed port of sink 0 "alsa_output.pci-0000_00_14.2.analog-stereo" to analog-output-headphones
( 25.569| 0.000) I: [pulseaudio] module-device-restore.c: Restoring volume for sink alsa_output.pci-0000_00_14.2.analog-stereo.
( 25.569| 0.000) D: [pulseaudio] core-subscribe.c: Dropped redundant event due to change event.
( 25.569| 0.000) D: [alsa-sink-ALC892 Analog] alsa-sink.c: Requested volume: 0: 20% 1: 20%
( 25.569| 0.000) D: [alsa-sink-ALC892 Analog] alsa-sink.c: in dB: 0: -41.80 dB 1: -41.80 dB
( 25.569| 0.000) D: [alsa-sink-ALC892 Analog] alsa-sink.c: Got hardware volume: 0: 20% 1: 20%
( 25.569| 0.000) D: [alsa-sink-ALC892 Analog] alsa-sink.c: in dB: 0: -41.80 dB 1: -41.80 dB
( 25.569| 0.000) D: [alsa-sink-ALC892 Analog] alsa-sink.c: Calculated software volume: 0: 100% 1: 100% (accurate-enough=yes)
( 25.569| 0.000) D: [alsa-sink-ALC892 Analog] alsa-sink.c: in dB: 0: 0.00 dB 1: 0.00 dB
( 25.569| 0.000) D: [alsa-sink-ALC892 Analog] sink.c: Volume going down to 13177 at 400878170
( 25.569| 0.000) D: [alsa-sink-ALC892 Analog] sink.c: Volume change to 13177 at 400878170 was written 34 usec late
( 25.569| 0.000) I: [pulseaudio] module-device-restore.c: Restored volume: 0: 20% 1: 20%
( 25.570| 0.000) I: [pulseaudio] module-device-restore.c: Restoring mute state for sink alsa_output.pci-0000_00_14.2.analog-stereo.
( 25.570| 0.000) D: [pulseaudio] core-subscribe.c: Dropped redundant event due to change event.
( 25.781| 0.210) D: [pulseaudio] module-alsa-card.c: Jack 'Front Headphone Jack' is now unplugged
( 25.781| 0.000) D: [pulseaudio] device-port.c: Setting port analog-output-headphones to status no
( 25.781| 0.000) D: [pulseaudio] module-switch-on-port-available.c: finding port analog-output-headphones
( 25.781| 0.000) D: [alsa-sink-ALC892 Analog] alsa-mixer.c: Activating path analog-output

( 25.783| 0.000) I: [pulseaudio] module-device-restore.c: Restored volume: 0: 39% 1: 39%
( 25.783| 0.000) I: [pulseaudio] module-device-restore.c: Restoring mute state for sink alsa_output.pci-0000_00_14.2.analog-stereo.
( 25.785| 0.001) D: [pulseaudio] core-subscribe.c: Dropped redundant event due to change event.
( 25.855| 0.070) D: [pulseaudio] module-alsa-card.c: Jack 'Front Headphone Jack' is now plugged in
( 25.855| 0.000) D: [pulseaudio] device-port.c: Setting port analog-output-headphones to status yes
( 25.855| 0.000) D: [pulseaudio] module-switch-on-port-available.c: finding port analog-output-headphones