[LG Optimus G (International)] dwielunski:
Here is a bit of the log, I'm not sure what's important. Once the screen shuts off you see the Error(-22) changing core status to offline constantly. It makes a persistent but very quiet tktktkt sound when screen is off.

There are also occasional "zap" sounds like a bug hitting the lamp but I didn't get one here. Those seem to be related to background processes and here I wiped data so nothing is updating in the background.

V/MediaPlayer[Native]( 3740): getCurrentPosition
E/HttpPlayerDriver( 299): getCurrentPosition
V/MediaPlayerService( 299): [13] getCurrentPosition = 142289
V/AudioPolicyManagerALSA( 299): AudioPolicyManager::getDeviceForStrategy()..str
ategy 0, fromCache 1
D/qdhwcomposer( 296): hwc_blank: Done blanking display: 0
D/SurfaceControl( 979): Excessive delay in blankDisplay() while turning screen
off: 206ms
I/QCOM PowerHAL( 979): Got set_interactive hint
W/linker ( 9514): liblgmabl.so has text relocations. This is wasting memory and
is a security risk. Please fix.
W/linker ( 9514): liblgRmsVolComp.so has text relocations. This is wasting memo
ry and is a security risk. Please fix.
W/linker ( 9514): libsrsprocessing.so has text relocations. This is wasting mem
ory and is a security risk. Please fix.
D/LgeKeyguardHostView( 1164): Show right-most page 0
D/KeyguardSecurityModel( 1164): getSecurityMode result is None
I/[SystemUI]LGPowerUI( 1164): onReceive = android.intent.action.SCREEN_OFF
E/CliptrayService( 1277): cliptrayEventReceiver :onReceiveandroid.intent.action.
SCREEN_OFF
D/KeyguardSecurityModel( 1164): getSecurityMode result is None
W/linker ( 9514): libnexplayersdk.so has text relocations. This is wasting memo
ry and is a security risk. Please fix.
D/NfcServiceBRCM( 1438): NFC is already turned off.
V/PhoneApp( 1405): Action intent recieved:android.intent.action.SCREEN_OFF
W/linker ( 9514): libaudioeffectsole.so has text relocations. This is wasting m
emory and is a security risk. Please fix.
D/AppCleanupService( 3019): android.intent.action.SCREEN_OFF
W/Settings( 979): Setting stay_on_while_plugged_in has moved from android.provi
der.Settings.System to android.provider.Settings.Global, returning read-only val
ue.
W/Settings( 979): Setting wifi_sleep_policy has moved from android.provider.Set
tings.System to android.provider.Settings.Global, returning read-only value.
D/WifiOffDelayIfNotUsed( 979): ACTION_SCREEN_OFF
D/AppCleanupService( 3019): AppUsageStatsSaveTask
I/[LGHome]EVENT( 4962): [Launcher.java:1742:onReceive()]Screen Off
I/Vold ( 288): [LGE][VOLD][NetlinkHandler.cpp][onEvent()] subsys:cpu, action
:0
D/AnalogClock( 1164): ACTION_SCREEN_OFF => Finish TimeTick
D/KeyguardSecurityModel( 1164): getSecurityMode result is None
V/AudioPolicyManagerALSA( 299): AudioPolicyManager::getDeviceForStrategy()..str
ategy 0, fromCache 1
E/NuCachedSource2( 299): [approx] mCacheOffset:0, totalSize:25165824, mLastAcce
ssPos:1430673
V/AwesomePlayer( 299): notifyListener_l()--> sendEvent
E/HttpPlayerDriver( 299): notify_callback msg=3, ext1=49, ext2=0
E/HttpPlayerDriver( 299): notify_callback send start
V/MediaPlayerService( 299): [13] notify (0xb82d9190, 3, 49, 0)
E/HttpPlayerDriver( 299): notify_callback send end
E/NuCachedSource2( 299): [approx] mCacheOffset:0, totalSize:25165824, mLastAcce
ssPos:1430673
V/AwesomePlayer( 299): cachedDurationUs = 2950.12 secs, eos=0
V/AwesomePlayer( 299): postBufferingEvent_l()
V/MediaPlayer[Native]( 3740): message received msg=3, ext1=49, ext2=0
V/MediaPlayer[Native]( 3740): buffering 49
V/MediaPlayer[Native]( 3740): callback application
V/MediaPlayer[Native]( 3740): back from callback
V/MediaPlayer[Native]( 3740): getCurrentPosition
E/HttpPlayerDriver( 299): getCurrentPosition
V/MediaPlayerService( 299): [13] getCurrentPosition = 142838
I/Vold ( 288): [LGE][VOLD][NetlinkHandler.cpp][onEvent()] subsys:cpu, action
:0
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
V/AudioPolicyManagerALSA( 299): AudioPolicyManager::getDeviceForStrategy()..str
ategy 0, fromCache 1
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
V/AudioPolicyManagerALSA( 299): AudioPolicyManager::getDeviceForStrategy()..str
ategy 0, fromCache 1
V/MediaPlayer[Native]( 3740): getCurrentPosition
E/HttpPlayerDriver( 299): getCurrentPosition
V/MediaPlayerService( 299): [13] getCurrentPosition = 143308
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
V/AudioPolicyManagerALSA( 299): AudioPolicyManager::getDeviceForStrategy()..str
ategy 0, fromCache 1
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/NuCachedSource2( 299): [approx] mCacheOffset:0, totalSize:25165824, mLastAcce
ssPos:1438405
V/AwesomePlayer( 299): notifyListener_l()--> sendEvent
E/HttpPlayerDriver( 299): notify_callback msg=3, ext1=49, ext2=0
E/HttpPlayerDriver( 299): notify_callback send start
V/MediaPlayerService( 299): [13] notify (0xb82d9190, 3, 49, 0)
E/HttpPlayerDriver( 299): notify_callback send end
V/MediaPlayer[Native]( 3740): message received msg=3, ext1=49, ext2=0
V/MediaPlayer[Native]( 3740): buffering 49
V/MediaPlayer[Native]( 3740): callback application
V/MediaPlayer[Native]( 3740): back from callback
E/NuCachedSource2( 299): [approx] mCacheOffset:0, totalSize:25165824, mLastAcce
ssPos:1438405
V/AwesomePlayer( 299): cachedDurationUs = 2949.15 secs, eos=0
V/AwesomePlayer( 299): postBufferingEvent_l()
D/WifiStateMachine( 979): handleMessage: E msg.what=131155
D/WifiStateMachine( 979): processMsg: ConnectedState
D/WifiStateMachine( 979): processMsg: L2ConnectedState
D/WifiStateMachine( 979): handleMessage: X
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
V/MediaPlayer[Native]( 3740): getCurrentPosition
E/HttpPlayerDriver( 299): getCurrentPosition
V/MediaPlayerService( 299): [13] getCurrentPosition = 143830
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
V/AudioPolicyManagerALSA( 299): AudioPolicyManager::getDeviceForStrategy()..str
ategy 0, fromCache 1
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline
E/MP-Decision( 1745): Error(-22) changing core 2 status to offline
E/MP-Decision( 1745): Error(-22) changing core 1 status to offline