Not sure if this is the time or place to ask this, and I may be well out of my depth here, but I am trying to find some guidance on the following....
Like many of my contacts, I have been trying to sort out problems with power management on machines that use 1394 to control audio devices. The basic problem is intermittent operation of the 1394 connection. The normal advice on the internet is for people with problems to reconfigure the PC as a "Standard PC", ie not use ACPI.
I have been testing using two machines, both rather old - an IBM TP R40 (1.3GHz Pentium M) and Acer 292 (1.5GHz Pentium M). These have built-in 1394, and I have tested the same machines with 5 separate IEEE 1394 pcmcia cards, all of which provide similar results. At the same time, 2 desktop machines work flawlessly with the same audio hardware. The audio device in my case is a Tascam FW-1884, which aiui uses both isochronous and asynchronous 1394 communication.
The failure I am experiencing is that after a random period of time the audio fails from the PC to the audio device, but audio still passes from the device into the PC. This looks as if the firewire audio settings are dropping to a different state. At the time of failure the hardware control of the audio device also fails.
It appears as though if I set the Power Management to "Always ON", the problem is much reduced or disappears completely. If I then bring the Power management back into operation, the problem doesn't return until I reboot the PC.
I appreciate that this is rather obscure and that my hardware is not current, but wonder whether anyone can offer any advice on how to proceed.