LCD背光不再工作:安卓

Question

按下Android电源按钮时，液晶屏背光灯会打开和关闭。但是从过去一天开始，我的液晶背光灯没有打开。按压 15 到 20 次后，背光灯打开几分钟，然后再次熄灭。当我执行电源按钮按下操作时，我发现它生成了一个错误报告，我想分析它。以下是它对背光的看法：

<6>[59171.668361,2] isl98611 backlight off 
<6>[59171.777714,7] Report pwrkey release event at: 2017-03-27 02:23:47 UTC
<6>[59171.803292,5] isl98611 backlight on 
<3>[59171.850005,7] wlan: [9525:E :WDA] Failure in host offload REQ WDI API, free all the memory 3
<36>[59171.900305,4] type=1400 audit(1490581427.758:36571): avc: denied { ioctl } for uid=1000 pid=4063 comm="Binder_5" path="socket:[2630050]" dev="sockfs" ino=2630050 ioctlcmd=7704 scontext=u:r:system_server:s0 tcontext=u:r:system_server:s0 tclass=unix_stream_socket permissive=0
<36>[59171.900723,4] type=1400 audit(1490581427.758:36572): avc: denied { ioctl } for uid=1000 pid=4063 comm="Binder_5" path="socket:[2630050]" dev="sockfs" ino=2630050 ioctlcmd=7704 scontext=u:r:system_server:s0 tcontext=u:r:system_server:s0 tclass=unix_stream_socket permissive=0
<6>[59171.904836,6] stml0xx spi0.0: Sending Stowed status 0, als 490, prox 0
<6>[59172.275559,7] Report pwrkey press event at: 2017-03-27 02:23:48 UTC
<6>[59172.431993,7] Report pwrkey release event at: 2017-03-27 02:23:48 UTC
<6>[59172.630772,7] Report pwrkey press event at: 2017-03-27 02:23:48 UTC
<6>[59172.762033,7] Report pwrkey release event at: 2017-03-27 02:23:48 UTC
<6>[59172.972182,7] isl98611 backlight off 
<3>[59173.070426,5] wlan: [9525:E :WDA] Failure in host offload REQ WDI API, free all the memory 3
<6>[59173.136285,6] isl98611 backlight on 
-----And so on, Here i was pressing the power button ON and OFF ------

------ BACKLIGHTS ------
LCD brightness=0
Button brightness=*** /sys/class/leds/button-backlight/brightness: No such file or directory
Keyboard brightness=*** /sys/class/leds/keyboard-backlight/brightness: No such file or directory
ALS mode=*** /sys/class/leds/lcd-backlight/als: No such file or directory
LCD driver registers:
*** /sys/class/leds/lcd-backlight/registers: No such file or directory

更新：在观看了DisplayPowerState代码后，我观察到它也记录了这些信息。

Display Power Controller Locked State:
mDisplayReadyLocked=true
mPendingRequestLocked=policy=DOZE, useProximitySensor=false, screenBrightness=70, screenAutoBrightnessAdjustment=-0.02734375, brightnessSetByUser=true, useAutoBrightness=true, blockScreenOn=false, lowPowerMode=false, boostScreenBrightness=false, dozeScreenBrightness=30, dozeScreenState=OFF, buttonBrightnessOverride=-1
mPendingRequestChangedLocked=false
mPendingWaitForNegativeProximityLocked=false
mPendingUpdatePowerStateLocked=false
Display Power Controller Configuration:
mScreenBrightnessDozeConfig=17
mScreenBrightnessDimConfig=10
mScreenBrightnessDarkConfig=1
mScreenBrightnessRangeMinimum=1
mScreenBrightnessRangeMaximum=256
mUseSoftwareAutoBrightnessConfig=true
mAllowAutoBrightnessWhileDozingConfig=false
mColorFadeFadesConfig=false
Display Power Controller Thread State:
mPowerRequest=policy=DOZE, useProximitySensor=false, screenBrightness=70,   screenAutoBrightnessAdjustment=-0.02734375, brightnessSetByUser=true,   useAutoBrightness=true, blockScreenOn=false, lowPowerMode=false, boostScreenBrightness=false, dozeScreenBrightness=30, dozeScreenState=OFF, buttonBrightnessOverride=-1
mWaitingForNegativeProximity=false
mProximitySensor={Sensor name="Proximity sensor", vendor="TAOS", version=1, type=8, maxRange=100.0, resolution=100.0, power=0.0467, minDelay=0}
mProximitySensorEnabled=false
mProximityThreshold=5.0
mProximity=Unknown
mPendingProximity=Unknown
mPendingProximityDebounceTime=-1 (59223063 ms ago)
mScreenOffBecauseOfProximity=false
mAppliedAutoBrightness=false
mAppliedDimming=true
mAppliedLowPower=false
mPendingScreenOnUnblocker=null
mPendingScreenOff=false
mReportedToPolicy=REPORTED_TO_POLICY_SCREEN_OFF
mScreenBrightnessRampAnimator.isAnimating()=false
mColorFadeOnAnimator.isStarted()=false
mColorFadeOffAnimator.isStarted()=false
Display Power State:
mScreenState=OFF
mScreenBrightness=0
mButtonBrightness=0
mScreenReady=true
mScreenUpdatePending=false
mColorFadePrepared=false
mColorFadeLevel=0.0
mColorFadeReady=true
mColorFadeDrawPending=false
Photonic Modulator State:
mPendingState=OFF
mPendingBacklight=0
mActualState=OFF
mActualBacklight=0
mStateChangeInProgress=false
mBacklightChangeInProgress=false
mPendingButtonLight=0
mActualButtonLight=0
 Color Fade State:
mPrepared=false
mMode=1
mDisplayLayerStack=0
mDisplayWidth=1080
mDisplayHeight=1920
mSurfaceVisible=false
mSurfaceAlpha=0.0
 Automatic Brightness Controller Configuration:
 mScreenAutoBrightnessSpline=MonotoneCubicSpline{[(0.0, 0.01953125:   0.0078125), (2.0, 0.03515625: 0.0063476563), (10.0, 0.07421875: 0.0032226562),  (50.0, 0.13671875: 0.002001953), (90.0, 0.234375: 0.0031738281), (100.0, 0.2734375: 0.0), (150.0, 0.2734375: 0.0), (200.0, 0.2734375: 0.0), (300.0, 0.2734375: 0.0), (400.0, 0.2734375: 0.0), (500.0, 0.40625: 8.0078124E-4), (800.0, 0.48828125: 2.734375E-4), (1000.0, 0.54296875: 1.8229167E-4), (1300.0, 0.5703125: 1.1795343E-4), (3000.0, 0.81640625: 8.995864E-5), (4000.0, 0.8515625: 3.564453E-5), (8000.0, 0.99609375: 0.0), (20000.0, 0.99609375: 0.0), (30000.0, 1.0: 3.90625E-7)]}
mScreenBrightnessRangeMinimum=1
mScreenBrightnessRangeMaximum=256
mLightSensorWarmUpTimeConfig=0
mBrighteningLightDebounceConfig=2000
mDarkeningLightDebounceConfig=8000
mResetAmbientLuxAfterWarmUpConfig=true
Automatic Brightness Controller State:
mLightSensor={Sensor name="Ambient Light sensor", vendor="TAOS", version=1,  type=5, maxRange=27000.0, resolution=1.0, power=0.25, minDelay=0}
mTwilight.getCurrentState()={TwilightState: isNight=false,     mYesterdaySunset=26 Mar 2017 6:52:39 p.m., mTodaySunrise=27 Mar 2017 5:58:44 a.m., mTodaySunset=27 Mar 2017 6:52:42 p.m., mTomorrowSunrise=28 Mar 2017 5:58:03 a.m.}
mLightSensorEnabled=false
mLightSensorEnableTime=59170878 (52192 ms ago)
mAmbientLux=489.99997
mBrighteningLuxThreshold=539.0
mDarkeningLuxThreshold=391.99997
mLastObservedLux=518.0
mLastObservedLuxTime=59186385 (36685 ms ago)
mRecentLightSamples=0
mAmbientLightRingBuffer=[]
mScreenAutoBrightness=99
mScreenAutoBrightnessAdjustment=-0.02734375
mLastScreenAutoBrightnessGamma=1.0304959
mDozing=true
mHbmSessionLimit=180000
mHbmDailyLimit=0
mHbmOn=false
mLimitHbm=false
mLastHbmStartTime=0
mHbmDailyDuration=0

这是否意味着什么，还是硬件问题，或者应该重新安装软件来解决它。

Answer 1

好吧，首先尝试使用设备的软件格式，看看它是否有效(大多数情况下它仍然有效(并且仍然出现错误，然后检查您的设备电源按钮是否可能已损坏 这发生在大多数三星设备上，互联网上有视频可以修复电源按钮或无法修复然后更换它。