[Nexus 4 Original Android Development] deltatux:
Found a bug through logcat. This happens when music is playing with screen off with stuttering playback. The network is switched off (no WiFi, no mobile data), I never turn on data unless I need it or I'm home with my WiFi.

I/MixpanelAPI( 3463): Cannot post message to Mixpanel Servers (May Retry)
I/MixpanelAPI( 3463): org.apache.http.conn.HttpHostConnectException: Connection to https://api.mixpanel.com refused
I/MixpanelAPI( 3463): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnect
ionOperator.java:183)
I/MixpanelAPI( 3463): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
I/MixpanelAPI( 3463): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
I/MixpanelAPI( 3463): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
I/MixpanelAPI( 3463): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
I/MixpanelAPI( 3463): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
I/MixpanelAPI( 3463): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
I/MixpanelAPI( 3463): at com.b.a.a.e.a(Unknown Source)
I/MixpanelAPI( 3463): at com.b.a.a.e.a(Unknown Source)
I/MixpanelAPI( 3463): at com.b.a.a.d.a(Unknown Source)
I/MixpanelAPI( 3463): at com.b.a.a.d.a(Unknown Source)
I/MixpanelAPI( 3463): at com.b.a.a.d.handleMessage(Unknown Source)
I/MixpanelAPI( 3463): at android.os.Handler.dispatchMessage(Handler.java:102)
I/MixpanelAPI( 3463): at android.os.Looper.loop(Looper.java:137)
I/MixpanelAPI( 3463): at com.b.a.a.c.run(Unknown Source)
I/MixpanelAPI( 3463): Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 443): connect failed:
ECONNREFUSED (Connection refused)
I/MixpanelAPI( 3463): at libcore.io.IoBridge.connect(IoBridge.java:114)
I/MixpanelAPI( 3463): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
I/MixpanelAPI( 3463): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
I/MixpanelAPI( 3463): at java.net.Socket.connect(Socket.java:843)
I/MixpanelAPI( 3463): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
I/MixpanelAPI( 3463): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnect
ionOperator.java:144)
I/MixpanelAPI( 3463): ... 14 more
I/MixpanelAPI( 3463): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
I/MixpanelAPI( 3463): at libcore.io.Posix.connect(Native Method)
I/MixpanelAPI( 3463): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
I/MixpanelAPI( 3463): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
I/MixpanelAPI( 3463): at libcore.io.IoBridge.connect(IoBridge.java:112)
I/MixpanelAPI( 3463): ... 19 more
D/dalvikvm( 3911): GC_EXPLICIT freed 815K, 45% free 9608K/17200K, paused 4ms+7ms, total 60ms
I/MixpanelAPI( 3463): Cannot post message to Mixpanel Servers (May Retry)
I/MixpanelAPI( 3463): org.apache.http.conn.HttpHostConnectException: Connection to http://api.mixpanel.com refused
I/MixpanelAPI( 3463): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnect
ionOperator.java:183)
I/MixpanelAPI( 3463): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
I/MixpanelAPI( 3463): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
I/MixpanelAPI( 3463): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
I/MixpanelAPI( 3463): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
I/MixpanelAPI( 3463): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
I/MixpanelAPI( 3463): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
I/MixpanelAPI( 3463): at com.b.a.a.e.a(Unknown Source)
I/MixpanelAPI( 3463): at com.b.a.a.e.a(Unknown Source)
I/MixpanelAPI( 3463): at com.b.a.a.d.a(Unknown Source)
I/MixpanelAPI( 3463): at com.b.a.a.d.a(Unknown Source)
I/MixpanelAPI( 3463): at com.b.a.a.d.handleMessage(Unknown Source)
I/MixpanelAPI( 3463): at android.os.Handler.dispatchMessage(Handler.java:102)
I/MixpanelAPI( 3463): at android.os.Looper.loop(Looper.java:137)
I/MixpanelAPI( 3463): at com.b.a.a.c.run(Unknown Source)
I/MixpanelAPI( 3463): Caused by: java.net.ConnectException: failed to connect to /127.0.0.1 (port 80): connect failed: E
CONNREFUSED (Connection refused)
I/MixpanelAPI( 3463): at libcore.io.IoBridge.connect(IoBridge.java:114)
I/MixpanelAPI( 3463): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
I/MixpanelAPI( 3463): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
I/MixpanelAPI( 3463): at java.net.Socket.connect(Socket.java:843)
I/MixpanelAPI( 3463): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
I/MixpanelAPI( 3463): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnect
ionOperator.java:144)
I/MixpanelAPI( 3463): ... 14 more
I/MixpanelAPI( 3463): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
I/MixpanelAPI( 3463): at libcore.io.Posix.connect(Native Method)
I/MixpanelAPI( 3463): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
I/MixpanelAPI( 3463): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
I/MixpanelAPI( 3463): at libcore.io.IoBridge.connect(IoBridge.java:112)
I/MixpanelAPI( 3463): ... 19 more
[...]
W/PlayEventLogger( 3623): No account for auth token provided
E/PlayEventLogger( 3623): Upload failed class java.net.UnknownHostException(Unable to resolve host "play.googleapis.com"
: No address associated with hostname)
[...]
D/SurfaceControl( 669): Excessive delay in blankDisplay() while turning screen off: 175ms
E/PowerHAL( 669): sync_thread: failed to send: No such file or directory
V/KeyguardHostView( 1090): show transport, gen:75
V/KeyguardHostView( 1090): music state changed: 3
W/TransportControlView( 1090): Updating seek bars; received invalid estimated media position (-1). Disabling seek.
W/FolderScanner2( 5329): Starting scan=/storage/emulated/legacy/Music/ fastScan=false
W/TransportControlView( 1090): Updating seek bars; received invalid estimated media position (-1). Disabling seek.
D/dalvikvm(16552): GC_CONCURRENT freed 1948K, 48% free 9031K/17200K, paused 2ms+1ms, total 43ms
W/AudioFlinger( 188): write blocked for 548 msecs, 13 delayed writes, thread 0xb5da4008
W/FolderScanner2( 5329): Old files/folders deleted from DB=0/0
W/FolderScanner2( 5329): Scanned dirs: 1100, files: 2608 in 4438ms, 587.7 files per sec, 247.9 folders per sec
W/LibraryScanner( 5329): processFiles in 28ms, files=0
W/LibraryScanner( 5329): doScan in 512ms

Music player: PowerAMP. 256 kbps AAC file playback.

Ever since I upgraded to Android 4.4, I've been getting a lot of music playback stuttering while the screen is off. It's starting to drive me insane.

deltatux