Android Power State Information Acquired

Introduction

Android Power state can be found by using console/ADB command - adb shell dumpsys power, then the message would be printed as follows,

Power Manager State:

  mIsPowered=true mPowerState=3 mScreenOffTime=958909 ms

  mPartialCount=1

  mWakeLockState=SCREEN_BRIGHT_BIT SCREEN_ON_BIT

  mUserState=

  mPowerState=SCREEN_BRIGHT_BIT SCREEN_ON_BIT

  mLocks.gather=SCREEN_BRIGHT_BIT SCREEN_ON_BIT

  mNextTimeout=66689 now=1022321 -955s from now

  mDimScreen=true mStayOnConditions=3 mPreparingForScreenOn=false mSkippedScreenOn=false

  mScreenOffReason=2 mUserState=0

  mBroadcastQueue={-1,-1,-1}

  mBroadcastWhy={0,0,0}

  mPokey=0 mPokeAwakeonSet=false

  mKeyboardVisible=false mUserActivityAllowed=false

  mKeylightDelay=6000 mDimDelay=47000 mScreenOffDelay=7000

  mPreventScreenOn=false  mScreenBrightnessOverride=-1  mButtonBrightnessOverride=-1

  mScreenOffTimeoutSetting=60000 mMaximumScreenOffTimeout=2147483647

  mLastScreenOnTime=1019715

  mBroadcastWakeLock=UnsynchronizedWakeLock(mFlags=0x1 mCount=0 mHeld=false)

  mStayOnWhilePluggedInScreenDimLock=UnsynchronizedWakeLock(mFlags=0x6 mCount=0 mHeld=true)

  mStayOnWhilePluggedInPartialLock=UnsynchronizedWakeLock(mFlags=0x1 mCount=0 mHeld=true)

  mPreventScreenOnPartialLock=UnsynchronizedWakeLock(mFlags=0x1 mCount=0 mHeld=false)

  mProximityPartialLock=UnsynchronizedWakeLock(mFlags=0x1 mCount=0 mHeld=false)

  mProximityWakeLockCount=0

  mProximitySensorEnabled=false

  mProximitySensorActive=false

  mProximityPendingValue=-1

  mLastProximityEventTime=0

  mLightSensorEnabled=false mLightSensorAdjustSetting=0.0

  mLightSensorValue=-1.0 mLightSensorPendingValue=-1.0

  mHighestLightSensorValue=-1 mWaitingForFirstLightSensor=false

  mLightSensorPendingDecrease=false mLightSensorPendingIncrease=false

  mLightSensorScreenBrightness=-1 mLightSensorButtonBrightness=-1 mLightSensorKeyboardBrightness=-1

  mUseSoftwareAutoBrightness=true

  mAutoBrightessEnabled=false

mScreenBrightnessAnimator:

  animating: start:0, end:102, duration:960, current:102

  startSensorValue:-1 endSensorValue:-1

  startTimeMillis:1019791 now:1022324

  currentMask:SCREEN_BRIGHT_BIT

mLocks.size=3:

  SCREEN_DIM_WAKE_LOCK           'StayOnWhilePluggedIn Screen Dim' activated (minState=1, uid=1000, pid=622)

  PARTIAL_WAKE_LOCK              'StayOnWhilePluggedIn Partial' activated (minState=0, uid=1000, pid=622)

  FULL_WAKE_LOCK                 'keyguard'ACQUIRE_CAUSES_WAKEUP  activated (minState=3, uid=1000, pid=622)

mPokeLocks.size=0:

The power state is listed by parameter mPowerState which has the flag value as follows,

1. // flags for setPowerState
2.     private static final int ALL_LIGHTS_OFF         = 0x00000000;
3.     private static final int SCREEN_ON_BIT          = 0x00000001;
4.     private static final int SCREEN_BRIGHT_BIT      = 0x00000002;
5.     private static final int BUTTON_BRIGHT_BIT      = 0x00000004;
6.     private static final int KEYBOARD_BRIGHT_BIT    = 0x00000008;
7.     private static final int BATTERY_LOW_BIT        = 0x00000010;

If device is on suspend mode, it would print 0 for mPowerState parameter.

When device is on screen on mode, the value 3 is shown for parameter mPowerState because of following reason.

1. // SCREEN_BRIGHT == screen on, screen backlight bright
2.     private static final int SCREEN_BRIGHT      = SCREEN_ON_BIT | SCREEN_BRIGHT_BIT;

where SCREEN_ON_BIT and SCREEN_BRIGHT_BIT are performed or operation. 

References

https://android.googlesource.com/platform/frameworks/base/+/android-4.1.2_r1/services/java/com/android/server/PowerManagerService.java