睡眠后按键无法唤醒的问题 ，如何看唤醒过程的log来定位问题

【使用说明】
(1) 以下是列出的整个按键唤醒的log关键点，每条都有粗体字说明其含义以及该注意的关键字；
(2) 红色的是kernel log，其他都是main log；
(3) 一条一条依次检查，直到如果发现某条log找不到，那问题就出在这个地方；
(4) 仅限于JB2之后的android版本，JB2之前流程相对比较简单；
kernel-Check Point【1】：按键中断
<5>[ 78.721504] 1)[power/PMIC] [pwrkey_int_handler] Press pwrkey
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Check Point【2】：上层收到按键事件
01-09 03:37:40.102 513 561 D WindowManager: interceptKeyTq keycode=26
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Check Point【3】：PMS的wakeUp被调用
01-09 03:37:40.171 513 531 D PowerManager_performance:
wakeUpNoUpdateLocked: eventTime=78826
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Check Point【4】：发出MSG_BROADCAST
01-09 03:37:40.171 513 531 D PowerManagerNotifier: onWakeUpStarted
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Check Point【5】：发出第一个MSG_UPDATE_POWER_STATE
01-09 03:37:40.174 513 531 D PowerManagerDisplayController: sendMessage
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Check Point【6】：收到并处理MSG_BROADCAST，并且状态是从2变到1
01-09 03:37:40.194 513 530 D PowerManagerNotifier: sendNextBroadcast,
mBroadcastedPowerState=2, mActualPowerState=1
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Check Point【7】：开始绘制keyguard的流程，发出NOTIFY_SCREEN_ON，等
windowToken
01-09 03:37:40.217 513 530 D KeyguardViewMediator: notifyScreenOnLocked
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Check Point【8】：收到并处理NOTIFY_SCREEN_ON
01-09 03:37:40.224 513 531 D KeyguardViewMediator: handleNotifyScreenOn
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Check Point【9】：完成绘制keyguard，拿到windowToken
01-09 03:37:40.370 513 531 I WindowManager: Lock screen displayed
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Check Point【10】：调用回调函数mSceenOnListener，解除Screen on Blocker，
mNestCount必须是0
01-09 03:37:40.371 513 531 D PowerManagerService: Screen on unblocked:
mNestCount=0
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Check Point【11】：处理第一个MSG_UPDATE_POWER_STATE，这里会第一次
scheduleScreenUpdate
01-09 03:37:40.254 513 546 D PowerManagerDisplayState: setScreenOn:
on=true
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Check Point【12】：第一次执行scheduleScreenUpdate，进入setState
01-09 03:37:40.330 513 546 D PowerManagerDisplayState: Requesting new
screen state: on=true, backlight=0
Check Point【13】：发出第二个MSG_UPDATE_POWER_STATE
01-09 03:37:40.334 513 546 D PowerManagerDisplayController: sendMessage.
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Check Point【14】：第一次执行mTask， on跟onChanged 必须都是true
01-09 03:37:40.334 513 546 D PowerManagerDisplayState: mTask: on = true,
onChanged = true, backlightChanged = false
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kernel-Check Point【15】：进入unblankAllDisplays，开始底层late_resume流程
01-09 03:37:40.334 513 546 D PowerManagerService: unblankAllDisplays in
...
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Check Point【16】：底层late_resume流程结束
01-09 03:37:40.673 513 546 D PowerManagerService-JNI: Excessive delay in
autosuspend_disable() while turning screen on: 337ms
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Check Point【17】：unblankAllDisplays流程结束
01-09 03:37:40.701 513 546 D PowerManager_performance: unblankAllDisplays
out ...
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Check Point【18】：处理第二个MSG_UPDATE_POWER_STATE
01-09 03:37:40.702 513 546 D PowerManagerDisplayController: setScreenOn
true
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Check Point【19】：前面的Screen On Blocker被解除，才会调用这里
01-09 03:37:40.702 513 546 D PowerManagerDisplayController: Unblocked
screen on after 447 ms
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Check Point【20】：设置ElectronBeamLevel，值不为0才能点亮背光，并且这里会
第二次scheduleScreenUpdate
01-09 03:37:40.704 513 546 D PowerManagerDisplayState:
setElectronBeamLevel: level=1.0
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Check Point【21】：第二次执行scheduleScreenUpdate，进入setState，注意
backlight值不为0
01-09 03:37:40.718 513 546 D PowerManagerDisplayState: Requesting new
screen state: on=true, backlight=86,
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Check Point【22】：第二次执行mTask，backlightChanged必须是true
01-09 03:37:40.721 513 546 D PowerManagerDisplayState: mTask: on = true,
onChanged = false, backlightChanged = true
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Check Point【23】：调用light service，写backlight节点，light 0表示
backlight
01-09 03:37:40.721 513 546 D LightsService: setLight_native: light=0,
colorARGB=0xff565656, flashMode=0,
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kernel-Check Point【24】：驱动底层背光生效
<4>[ 79.447236] (1)[546owerManagerSer]mt65xx_leds_set_cust: set
brightness, name:LCD-backlight, mode:6, level:86

mark  

好资料。不错。

谢谢支持