当我执行其他蓝牙密集型操作（例如通过 BT 将文件发送到另一台设备）时，我有一个设备会不断掉落我的蓝牙耳机。我在想问题可能是设备的波特率设置得太低。
顺便说一句，我的错误日志如下：
10-12 14:35:17.070 D/KeyguardViewMediator( 2173): wakeWhenReadyLocked(3)
10-12 14:35:17.070 I/power ( 2173): *** set_screen_state 1
10-12 14:35:17.080 D/PowerManagerService( 2173): setPowerState() wifi is enabled, will reconnect
10-12 14:35:17.310 I/dispd ( 2030): path:/devices/platform/imx-i2c.0/i2c-0/0-0066/backlight/0-0066
10-12 14:35:17.310 I/InputDispatcher( 2173): Dropped event because input dispatch is disabled.
10-12 14:35:17.340 D/Sensors ( 2173): enable_sensor sensor_type=1, what =0x101
10-12 14:35:17.340 D/Sensors ( 2173): enable..mEnabled=0x1
10-12 14:35:17.340 D/Sensors ( 2173): AccelSensor....setDelay, ms=200,handle=0
10-12 14:35:17.340 D/Sensors ( 2173): AccelSensor....setDelay, mMinPollDelay=0
10-12 14:35:17.340 D/Sensors ( 2173): AccelSensor....setDelay, mMaxPollDelay=0
10-12 14:35:17.340 D/Sensors ( 2173): AccelSensor....setDelay, delay=200,poll_sysfs_file=
10-12 14:35:17.340 D/Sensors ( 2173): AccelSensor....setDelay, ms=200,handle=0
10-12 14:35:17.340 D/Sensors ( 2173): AccelSensor....setDelay, mMinPollDelay=0
10-12 14:35:17.340 D/Sensors ( 2173): AccelSensor....setDelay, mMaxPollDelay=0
10-12 14:35:17.340 D/Sensors ( 2173): AccelSensor....setDelay, delay=200,poll_sysfs_file=
10-12 14:35:17.350 I/BaseActivity( 6394): onResume - com.songbirdnest.philipsplayer.activities.ContentBrowser
10-12 14:35:17.430 I/LockScreenService( 4281): Received Action -- android.intent.action.SCREEN_ON
10-12 14:35:17.450 I/SongListingView( 6394): onResume
10-12 14:35:17.450 V/MediaProvider( 2437): 1
10-12 14:35:17.470 D/SurfaceFlinger( 2173): Screen about to return, flinger = 0x943d8
10-12 14:35:17.480 V/MediaProvider( 2437): 1
10-12 14:35:17.480 I/ContentObserver( 6394): SongListingView: register
10-12 14:35:18.010 V/MediaProvider( 2437): 2
10-12 14:35:18.080 V/MediaProvider( 2437): 2
10-12 14:35:18.090 D/PowerManagerService( 2173): mWifiReconnectTask() +++ enter +++
10-12 14:35:18.090 E/wpa_supplicant( 6372): wpa_driver_priv_driver_cmd failed
10-12 14:35:18.090 D/PowerManagerService( 2173): info.getSupplicantState()=SCANNING
10-12 14:35:18.090 D/PowerManagerService( 2173): mWifiReconnectTask() --- exit ---
10-12 14:35:18.100 I//system/bin/wpa_supplicant( 6371): ioctl[SIOCSIWPRIV]: Bad address
10-12 14:35:18.170 D/dalvikvm( 4281): GC_CONCURRENT freed 467K, 52% free 2976K/6151K, external 1204K/1228K, paused 3ms+9ms
10-12 14:35:18.360 D/dalvikvm( 4281): GC_CONCURRENT freed 506K, 52% free 2982K/6151K, external 1204K/1228K, paused 3ms+3ms
10-12 14:35:18.420 V/MediaProvider( 2437): 2
10-12 14:35:18.440 V/MediaProvider( 2437): 2
10-12 14:35:18.550 D/dalvikvm( 4281): GC_EXTERNAL_ALLOC freed 261K, 52% free 2959K/6151K, external 1204K/1228K, paused 65ms
10-12 14:35:18.810 D/dalvikvm( 4281): GC_CONCURRENT freed 510K, 52% free 2982K/6151K, external 1204K/1716K, paused 3ms+7ms
10-12 14:35:18.940 D/dalvikvm( 6394): GC_EXTERNAL_ALLOC freed 908K, 50% free 3410K/6791K, external 3600K/3877K, paused 83ms
10-12 14:35:18.990 W/InputManagerService( 2173): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@2b2260c8
10-12 14:35:20.739 I/wpa_supplicant( 6372): CTRL-EVENT-SCAN-RESULTS Ready
10-12 14:35:23.260 I/MediaPlayer( 4281): ----- MediaPlayer start:::
10-12 14:35:23.270 I/OMXPlayer( 2160): Resume player.
10-12 14:35:23.290 D/A2DP ( 2160): bluetooth_start
10-12 14:35:25.350 D/A2DP ( 2160): Received BT_RESPONSE - BT_START_STREAM
10-12 14:35:25.350 D/A2DP ( 2160): Received BT_RESPONSE - BT_NEW_STREAM
10-12 14:35:25.370 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:Playing from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:35:25.390 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:PropertyChanged from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:35:25.400 W/AudioFlinger( 2160): write blocked for 2110 msecs, 5 delayed writes, thread 0x52e70
10-12 14:35:25.400 V/FullSound2( 2160): FullSound2_command start
10-12 14:35:25.400 V/FullSound2( 2160): FullSound2_command cmdCode Case: EFFECT_CMD_SET_VOLUME start
10-12 14:35:25.400 V/FullSound2( 2160): FullSound2_command cmdCode Case: EFFECT_CMD_SET_VOLUME end, L=1331200, R=1331200
10-12 14:35:25.400 V/FullSound2( 2160): FullSound2_command end...
10-12 14:35:25.400 V/FullSound2( 2160):
10-12 14:35:25.430 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:PropertyChanged from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:35:25.440 V/BluetoothEventRedirector( 2363): Received android.bluetooth.a2dp.action.SINK_STATE_CHANGED
10-12 14:35:25.440 D/CachedBluetoothDevice( 2363): onProfileStateChanged: profile A2DP newProfileState 4
10-12 14:35:25.450 D/BluetoothA2dpService( 2173): A2DP state : device: 58:17:0C:ED:E1:01 State:2->4
10-12 14:35:28.010 I/wpa_supplicant( 6372): CTRL-EVENT-SCAN-RESULTS Ready
10-12 14:35:30.750 D/dalvikvm( 2363): GC_EXPLICIT freed 271K, 49% free 3228K/6215K, external 1158K/1615K, paused 154ms
10-12 14:35:33.610 D/FlurryAgent( 6394): Ending session
10-12 14:35:33.690 D/FlurryAgent( 6394): Continuing previous session
10-12 14:35:35.260 I/wpa_supplicant( 6372): CTRL-EVENT-SCAN-RESULTS Ready
10-12 14:35:38.330 D/dalvikvm( 2419): GC_CONCURRENT freed 431K, 52% free 2718K/5639K, external 716K/1038K, paused 25ms+2ms
10-12 14:35:40.230 I/OMXPlayer( 2160): Pause player.
10-12 14:35:40.260 D/ALSAModule( 2160): route called for devices 00000000 in mode 0...
10-12 14:35:40.320 V/FullSound2( 2160): FullSound2_command start
10-12 14:35:40.320 V/FullSound2( 2160): FullSound2_command cmdCode Case: EFFECT_CMD_SET_VOLUME start
10-12 14:35:40.320 V/FullSound2( 2160): FullSound2_command cmdCode Case: EFFECT_CMD_SET_VOLUME end, L=0, R=0
10-12 14:35:40.320 V/FullSound2( 2160): FullSound2_command end...
10-12 14:35:40.320 V/FullSound2( 2160):
10-12 14:35:40.420 D/dalvikvm( 4281): GC_CONCURRENT freed 454K, 53% free 2912K/6151K, external 1204K/1716K, paused 2ms+12ms
10-12 14:35:42.250 I/dispd ( 2030): path:/devices/platform/pmic_battery.1/power_supply/battery
10-12 14:35:42.510 I/wpa_supplicant( 6372): CTRL-EVENT-SCAN-RESULTS Ready
10-12 14:35:43.330 D/A2DP ( 2160): a2dp_stop
10-12 14:35:43.330 D/A2DP ( 2160): bluetooth_stop
10-12 14:35:43.430 D/A2DP ( 2160): Received BT_RESPONSE - BT_STOP_STREAM
10-12 14:35:43.430 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:Stopped from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:35:43.440 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:PropertyChanged from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:35:43.440 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:PropertyChanged from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:35:43.440 E/BluetoothService( 2173): test1 mBluetoothState=12
10-12 14:35:43.460 V/BluetoothEventRedirector( 2363): Received android.bluetooth.a2dp.action.SINK_STATE_CHANGED
10-12 14:35:43.460 D/CachedBluetoothDevice( 2363): onProfileStateChanged: profile A2DP newProfileState 2
10-12 14:35:43.470 D/BluetoothA2dpService( 2173): A2DP state : device: 58:17:0C:ED:E1:01 State:4->2
10-12 14:35:49.760 I/wpa_supplicant( 6372): CTRL-EVENT-SCAN-RESULTS Ready
10-12 14:35:51.250 I/dispd ( 2030): path:/devices/virtual/bluetooth/hci0/hci0:3
10-12 14:35:51.260 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.Device:PropertyChanged from /org/bluez/5644/hci0/dev_94_63_D1_3B_91_25
10-12 14:35:51.690 I/BtOppRfcommListener( 4261): Accepted connectoin from 94:63:D1:3B:91:25
10-12 14:35:51.690 I/BtOpp Service( 4261): Start Obex Server
10-12 14:35:52.880 I/OMXPlayer( 2160): Loading content: sharedfd://35:0:20052:13
10-12 14:35:52.880 I/OMXPlayer( 2160): LEVEL: 1 FUNCTION: MediaTypeInspect LINE: 1415
10-12 14:35:52.880 I/OMXPlayer( 2160): Can't inspect media content type by subfix.
10-12 14:35:52.990 I/OMXPlayer( 2160): nPreCacheSize = 20052
10-12 14:35:53.220 I/AudioService( 2173): AudioFocus requestAudioFocus() from android.media.AudioManager@2b11b330
10-12 14:35:53.220 I/MediaPlayer( 2173): ----- MediaPlayer start:::
10-12 14:35:53.220 I/OMXPlayer( 2160): start player.
10-12 14:35:53.220 D/A2DP ( 2160): bluetooth_start
10-12 14:35:56.230 W/AudioTrack( 2160): obtainBuffer timed out (is the CPU pegged?) 0x133138 user=00002800, server=00000000
10-12 14:35:56.790 I/OMXPlayer( 2160): Stop Player.
10-12 14:35:57.000 E/A2DP ( 2160): BT_START_STREAM failed : I/O error(5)
10-12 14:35:57.000 D/A2DP ( 2160): bluetooth_close
10-12 14:35:57.000 E/A2dpAudioInterface( 2160): a2dp_write failed err: -110
10-12 14:35:57.030 I/wpa_supplicant( 6372): CTRL-EVENT-SCAN-RESULTS Ready
10-12 14:35:57.050 W/AudioFlinger( 2160): write blocked for 3837 msecs, 6 delayed writes, thread 0x52e70
10-12 14:35:57.060 D/A2DP ( 2160): bluetooth_init
10-12 14:35:57.730 D/dalvikvm( 4261): GC_EXPLICIT freed 271K, 53% free 2981K/6215K, external 731K/1038K, paused 90ms
10-12 14:35:57.970 I/ActivityManager( 2173): Starting: Intent { dat=content://com.android.bluetooth.opp/btopp/3 flg=0x10000000 cmp=com.android.bluetooth/.opp.BluetoothOppIncomingFileConfirmActivity } from pid 4261
10-12 14:35:57.980 I/BaseActivity( 6394): onPause - com.songbirdnest.philipsplayer.activities.ContentBrowser
10-12 14:35:57.990 I/SongListingView( 6394): onPause
10-12 14:35:57.990 I/ContentObserver( 6394): SongListingView: unregister
10-12 14:35:57.990 I/ContentObserver( 6394): SongListingView-Filter: unregister
10-12 14:35:57.990 I/ContentObserver( 6394): SongListingView-Filter: null cursor
10-12 14:35:58.060 E/A2dpAudioInterface( 2160): a2dp_write failed err: -110
10-12 14:35:58.120 D/A2DP ( 2160): bluetooth_configure
10-12 14:35:58.120 D/A2DP ( 2160): Received BT_RESPONSE - BT_GET_CAPABILITIES
10-12 14:35:58.120 D/A2DP ( 2160): Received BT_RESPONSE - BT_OPEN
10-12 14:35:58.120 D/A2DP ( 2160): bluetooth_a2dp_hw_params sending configuration:
10-12 14:35:58.120 D/A2DP ( 2160): channel_mode: JOINT STEREO
10-12 14:35:58.120 D/A2DP ( 2160): frequency: 44100
10-12 14:35:58.120 D/A2DP ( 2160): allocation_method: LOUDNESS
10-12 14:35:58.120 D/A2DP ( 2160): subbands: 8
10-12 14:35:58.120 D/A2DP ( 2160): block_length: 16
10-12 14:35:58.120 D/A2DP ( 2160): min_bitpool: 2
10-12 14:35:58.120 D/A2DP ( 2160): max_bitpool: 53
10-12 14:35:58.120 D/A2DP ( 2160): Received BT_RESPONSE - BT_SET_CONFIGURATION
10-12 14:35:58.120 D/A2DP ( 2160): MTU: 672
10-12 14:35:58.120 D/A2DP ( 2160): frame_duration: 2902 us
10-12 14:35:58.120 D/A2DP ( 2160): allocation=0
10-12 14:35:58.120 D/A2DP ( 2160): subbands=1
10-12 14:35:58.120 D/A2DP ( 2160): blocks=3
10-12 14:35:58.120 D/A2DP ( 2160): bitpool=53
10-12 14:35:58.120 D/A2DP ( 2160): bluetooth_start
10-12 14:35:58.120 E/A2DP ( 2160): BT_START_STREAM failed : I/O error(5)
10-12 14:35:58.120 D/A2DP ( 2160): bluetooth_close
10-12 14:35:58.460 I/ActivityManager( 2173): Displayed com.android.bluetooth/.opp.BluetoothOppIncomingFileConfirmActivity: +454ms
10-12 14:35:59.120 E/A2dpAudioInterface( 2160): a2dp_write failed err: -110
10-12 14:35:59.120 W/AudioTrack( 2160): obtainBuffer timed out (is the CPU pegged?) 0x133138 user=00003c00, server=00001400
10-12 14:35:59.180 D/A2DP ( 2160): bluetooth_init
10-12 14:35:59.180 D/ALSAModule( 2160): route called for devices 00000000 in mode 0...
10-12 14:35:59.190 I/AudioService( 2173): AudioFocus abandonAudioFocus() from android.media.AudioManager@2b11b330
10-12 14:35:59.240 I/BaseActivity( 6394): onResume - com.songbirdnest.philipsplayer.activities.ContentBrowser
10-12 14:35:59.360 I/SongListingView( 6394): onResume
10-12 14:35:59.370 V/MediaProvider( 2437): 1
10-12 14:35:59.400 V/MediaProvider( 2437): 1
10-12 14:35:59.400 I/ContentObserver( 6394): SongListingView: register
10-12 14:35:59.410 W/InputManagerService( 2173): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@2b227768
10-12 14:35:59.970 V/MediaProvider( 2437): 2
10-12 14:36:00.000 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:Disconnected from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:36:00.010 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:PropertyChanged from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:36:00.010 E/BluetoothEventLoop.cpp( 2173): event_filter: Received signal org.bluez.AudioSink:PropertyChanged from /org/bluez/5644/hci0/dev_58_17_0C_ED_E1_01
10-12 14:36:00.030 I/dispd ( 2030): path:/devices/virtual/input/input5/event5
10-12 14:36:00.030 I/EventHub( 2173): Removed device: path=/dev/input/event5 name=AVRCP id=0x10004 (of 0x5) index=6 fd=210 classes=0x1
10-12 14:36:00.030 I/InputReader( 2173): Device removed: id=0x10004, name=AVRCP, sources=00000101
10-12 14:36:00.040 D/BluetoothA2dpService( 2173): A2DP state : device: 58:17:0C:ED:E1:01 State:2->0
10-12 14:36:00.040 V/BluetoothEventRedirector( 2363): Received android.bluetooth.a2dp.action.SINK_STATE_CHANGED
10-12 14:36:00.040 D/CachedBluetoothDevice( 2363): onProfileStateChanged: profile A2DP newProfileState 0
10-12 14:36:00.050 V/FullSound2( 2160): FullSound2_command start
10-12 14:36:00.050 V/FullSound2( 2160): FullSound2_command cmdCode Case: EFFECT_CMD_CONFIGURE start
10-12 14:36:00.050 V/FullSound2( 2160): FullSound2_configure start
10-12 14:36:00.050 V/FullSound2( 2160): FulSound2_Configure : sampling rate = 44100
10-12 14:36:00.050 V/FullSound2( 2160): FullSound2_configure End
10-12 14:36:00.050 V/FullSound2( 2160): FullSound2_command cmdCode Case: EFFECT_CMD_CONFIGURE end
10-12 14:36:00.050 V/FullSound2( 2160): FullSound2_command end...
10-12 14:36:00.050 V/FullSound2( 2160):
10-12 14:36:00.060 V/MediaProvider( 2437): 2
10-12 14:36:00.070 I/dispd ( 2030): path:/devices/virtual/input/input5
10-12 14:36:00.180 E/A2dpAudioInterface( 2160): a2dp_write failed err: -110
10-12 14:36:00.270 D/A2DP ( 2160): a2dp_cleanup
10-12 14:36:00.270 D/A2DP ( 2160): bluetooth_close
10-12 14:36:00.270 D/A2DP ( 2160): a2dp_thread finished
10-12 14:36:00.270 I/BluetoothDeviceProfileState( 2173): Entering IncomingA2dp state with: 8
10-12 14:36:00.270 I/BluetoothDeviceProfileState( 2173): Processing command:8
10-12 14:36:00.270 I/BluetoothDeviceProfileState( 2173): Entering ACL Connected state with: 102
hcidump 显示设备此时关闭连接。