Firewire issues with Leopard

I updated to Leopard few days ago on my G5 Dual 2Ghz
FW Card is http://www.sonnettech.fr/product/tango_2.html
- First problem was : tasks UserEventAgent and CoreAudio turned to red into activity monitor
- I sampled the tasks (Actity monitor/Inspect) and here are the loops :
UserEventAgent sample ---------------------
Sampling process 1092 for 3 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Analysis of sampling UserEventAgent (pid 1092) every 1 millisecond
Call graph:
2286 Thread_2503
2286 0xffc
2286 0x25ec
2286 0x385c
2286 CFRunLoopRun
2286 CFRunLoopRunSpecific
2286 mach_msg
2286 machmsgtrap
2286 machmsgtrap
2286 Thread_2603
2286 pthreadstart
2286 AVS::DestroyAVCDeviceController(AVS::AVCDeviceController*)
2286 CFRunLoopRun
2286 CFRunLoopRunSpecific
2286 mach_msg
2286 machmsgtrap
2286 machmsgtrap
2286 Thread_2703
2286 pthreadstart
2286 CAPThread::Entry(CAPThread*)
2286 HALRunLoop::OwnThread(void*)
2286 CFRunLoopRunSpecific
2286 mach_msg
2286 machmsgtrap
2286 machmsgtrap
Total number in stack (recursive counted multiple, when >=5):
Sort by top of stack, same collapsed (when >= 5):
machmsgtrap 6858
Sample analysis of process 1092 written to file /dev/stdout
CoreAudio sample ------------------------
Sampling process 1094 for 3 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Analysis of sampling coreaudiod (pid 1094) every 1 millisecond
Call graph:
2163 Thread_2503
2163 0xbfffff38
2163 0x2040
2163 0xcdf0
2163 CFRunLoopRunSpecific
2163 mach_msg
2163 machmsgtrap
2163 machmsgtrap
2163 Thread_2603
2163 pthreadstart
2163 AVS::DestroyAVCDeviceController(AVS::AVCDeviceController*)
2163 CFRunLoopRun
2163 CFRunLoopRunSpecific
2163 mach_msg
2163 machmsgtrap
2163 machmsgtrap
2163 Thread_2703
2163 pthreadstart
2163 CAPThread::Entry(CAPThread*)
2163 HALRunLoop::OwnThread(void*)
2163 CFRunLoopRunSpecific
2163 mach_msg
2163 machmsgtrap
2163 machmsgtrap
Total number in stack (recursive counted multiple, when >=5):
Sort by top of stack, same collapsed (when >= 5):
machmsgtrap 6489
Sample analysis of process 1094 written to file /dev/stdout
After some investigation it occured that
"2163 AVS::DestroyAVCDeviceController(AVS::AVCDeviceController*)"
leads to some other components :
AVC.plugin that is a core media IO service and IOFireWireAVC.kext that handles I/O for Firewire
So I ran the test : stop my external drives connected to the FW Sonnet card, and there it was ! no more task in red... I know many of my friends had same issues with same G5 (2, 2.2 ,2.7) and especially, using video apps like final cut with FW cameras and external drives. I suspect de dual kext to be a part of the problem here, because on other Macs, nothing happens like this.
Can I hope for some help or can we expect driver update to get started at work with Leopard soon ?
Thx for answers

Hi all
Since I've updated to Leopard, I've encountered the same problem - without Sonnet Card - using FW800 port with a hard disk and ADVC100 in a FW400 port.
Only UserEvenAgent freezes.
Sampling process 162 for 3 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Analysis of sampling UserEventAgent (pid 162) every 1 millisecond
Call graph:
2255 Thread_2503
2255 0xbffffd40
2255 0x25ec
2255 0x385c
2255 CFRunLoopRun
2255 CFRunLoopRunSpecific
2255 mach_msg
2255 machmsgtrap
2255 machmsgtrap
2255 Thread_2603
2255 pthreadstart
2255 AVS::DestroyAVCDeviceController(AVS::AVCDeviceController*)
2255 CFRunLoopRun
2255 CFRunLoopRunSpecific
2255 mach_msg
2255 machmsgtrap
2255 machmsgtrap
2255 Thread_2703
2255 pthreadstart
2255 CAPThread::Entry(CAPThread*)
2255 HALRunLoop::OwnThread(void*)
2255 CFRunLoopRunSpecific
2255 mach_msg
2255 machmsgtrap
2255 machmsgtrap
Total number in stack (recursive counted multiple, when >=5):
Sort by top of stack, same collapsed (when >= 5):
machmsgtrap 6765
Sample analysis of process 162 written to file /dev/stdout
Perhaps an Apple update could be needed.
I'll try your solution - but loose the use of my 500Gb HD is difficult
Regards
Didier

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