[awaspaas]

Every once in a while, esp. when playing a video or doing something processor-intensive, the audio on my Cube 450 will hiccup, cut out, or get distorted. An entry to system.log is added that corresponds with each incident:

mach_kernel: USBF: 108587.620 AppleUSBOHCI[0x24d1000] Watchdog detected dead controller (hcca #: 48268, hc #: 48999)

Any ideas on how to fix it? Should I send a feedback to Apple?

[awaspaas]

Also, every so often, the sound dies altogether. If I unplug the USB apple pro speakers, loginwindow crashes:

Date/Time: 2003-06-15 02:44:41 -0500
OS Version: 10.2.6 (Build 6L60)
Host: xxxxx-26.mn.client2.attbi.com

Command: loginwindow
PID: 834

Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_INVALID_ADDRESS (0x0001) at 0x00115008

Thread 0:
#0 0x90073c48 in mach_msg_trap
#1 0x90005f90 in mach_msg
#2 0x901489f0 in __CFRunLoopRun
#3 0x90180f58 in CFRunLoopRunSpecific
#4 0x969a3b70 in RunCurrentEventLoopInMode
#5 0x969b3b00 in ReceiveNextEventCommon
#6 0x969dabbc in BlockUntilNextEventMatchingListInMode
#7 0x9308dedc in _DPSNextEvent
#8 0x930a0158 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
#9 0x930b1d88 in -[NSApplication run]
#10 0x00006c18 in 0x6c18
#11 0x00004c3c in 0x4c3c
#12 0x00004abc in 0x4abc

Thread 1:
#0 0x9003eaa8 in semaphore_wait_signal_trap
#1 0x9003e8c4 in _pthread_cond_wait
#2 0x94d9123c in _ZN7CAGuard4WaitEv
#3 0x94d96514 in _ZN14XIOAudioDevice7StoppedEv
#4 0x94d948a8 in _ZN12XBasicDevice13DisableIOProcEPFlmPK14AudioTime StampPK15AudioBufferListS2_PS3_S2_PvE
#5 0x94d88cc4 in _ZN16XThreadedCommand7ExecuteEv
#6 0x94d8c6a8 in _ZN12XBasicDevice14ProcessCommandEP9CACommandb
#7 0x94da2fe4 in _ZN12XBasicDevice7StopAllEv
#8 0x94db3d00 in _ZN23HALIOAudioDeviceFactory12DeviceIsDeadEP14XIOA udioDevice
#9 0x94da9f04 in _ZN14XIOAudioDevice25IOServiceInterestCallbackEPvj jS0_
#10 0x90494908 in IODispatchCalloutFromCFMessage
#11 0x9015bd8c in __CFMachPortPerform
#12 0x9015bbf8 in __CFRunLoopDoSource1
#13 0x90148c9c in __CFRunLoopRun
#14 0x90180f58 in CFRunLoopRunSpecific
#15 0x907f5a0c in -[NSRunLoop runMode:beforeDate:]
#16 0x90809244 in -[NSRunLoop run]
#17 0x00336688 in -[BezelServicesTask cgsListen:]
#18 0x9081cd38 in forkThreadForFunction
#19 0x90020d48 in _pthread_body

Thread 2:
#0 0x90073c48 in mach_msg_trap
#1 0x90005f90 in mach_msg
#2 0x0000a3b0 in 0xa3b0
#3 0x0000a2a0 in 0xa2a0
#4 0x90020d48 in _pthread_body

Thread 3:
#0 0x90000e2c in read
#1 0x0000af6c in 0xaf6c
#2 0x90020d48 in _pthread_body

Thread 4 Crashed:
#0 0x94d84b18 in _ZN14XIOAudioDevice20GetCurrent0TimeStampER14Audio TimeStamp
#1 0x94d8393c in _ZN14XIOAudioDevice16Update0TimeStampEv
#2 0x94d820c4 in _ZN15XThreadedDevice8IOThreadEv
#3 0x94d95a24 in _ZN15XThreadedDevice13IOThreadEntryEPv
#4 0x94d911b0 in _ZN9CAPThread5EntryEPS_
#5 0x90020d48 in _pthread_body

PPC Thread State:
srr0: 0x94d84b18 srr1: 0x0000f030 vrsave: 0x00000000
xer: 0x00000000 lr: 0x94d84ad0 ctr: 0x94d84ac0 mq: 0x00000000
r0: 0x94d8393c r1: 0xf01aab10 r2: 0x900e8dd8 r3: 0x01efb160
r4: 0xf01aabc0 r5: 0x00000000 r6: 0x05f5e100 r7: 0x94d827a8
r8: 0xa0001064 r9: 0x00115000 r10: 0x002f7880 r11: 0xa4d8096c
r12: 0x94d84ac0 r13: 0x00000000 r14: 0x00000000 r15: 0x00000000
r16: 0x00000000 r17: 0x00000000 r18: 0x00000000 r19: 0x00000000
r20: 0x00000000 r21: 0x00000000 r22: 0x01efb4d8 r23: 0x00000000
r24: 0x00000000 r25: 0x00000000 r26: 0x00000000 r27: 0x00d3ca8c
r28: 0x00000286 r29: 0x4fbf8972 r30: 0x01efb160 r31: 0x94d84ad0

[Ricky]

I can't be of much help other than to say mine does the same thing. I won't even be doing anything other than having a song playing, and the sound will become muffled. Sometimes it'll also just stop. Used to happen all the time to me using 10.1, went away with 10.2.0, but came back after the updates started. If I unplug the speakers from the display, hello kernal panic. USB and audio just don't seem like a good combination to me.

[awaspaas]

See the discussion on the Apple forums:

http://discussions.info.apple.com/[email protected]

[Silky Voice of The Gorn]

I've been having this problem with my Cube for ages. There is no solution, and Apple doesn't seem to care much about Cube owners.

My work around for the windowmanager crash is to open the Sound system panel, switch the output to my iMic, unplug/plug in the usb, an switch it back to "Speakers".