Satellite M40: USB Audio doesn't work properly in ACPI mode

Hi all,
I just bought a Satellite M40 laptop which purpose will be to be used as a mobile audio system.
For that, USB audio devices are a great solution.
Unfortunately, although it was working properly while recording (sound is perfect with all USB Audio compliant devices I could test), there's an issue in Playback as I got lots of clicks and pops.
After lots of tryings and google searches, I fixed the problem by switching from ACPI computer to Standard PC mode.
That's a workaround.
But this way, I don't know anymore what's my battery status, and my laptop do not shutdown automatically.
In fact, my laptop is no more managed as a laptop :(
I suspect a very serious issue in one of the Toshiba components management. Especially, I would not surprised to be told that power management leads to some regular short system freeze, and thus the 10ms USB audio buffers fall into underrun.
This would not bother me so much if I was not part of the technical support team of a company that is also launching some new USB audio products that will fail to work properly with laptops.
My question is :
Is there any driver / bios update that gets rid of this issue ?
If someone from the Toshiba technical support wants to handle this issue directly with me, I would be pleased to help him, as I'm concerned professionnaly and personnaly.
Thanks in advance.
[Edited by: admin]

Thanks for your help Jeffrey,
But
- I checked with several USB audio devices, from different providers. The issue is the same.
- I checked with several applications (Winamp, MediaPlayer, ...). Same issue.
- I checked these devices with different laptops (tried 3 different models) : I have NO PROBLEM.
- The USB devices I use do not need external power supply. I tried EDIROL UA-25 which works perfectly in any case, but not with my TOSHIBA M40.
- I agree that some application can disturb audio management. But in that case, I would like to know which one from the standard installation is the cause, so that I can fire it. It's anyway curious to see that switching from ACPI to Standard mode fixes the issue, as all applications are still there. I would say the applications are not the issue, then.
- All Microsoft updates have already been installed
- I think I tried everything that could be done by closing applications, changing power management modes, system cache, ...
- I have no other hardware device connected/installed (printer or whatever)
- RECORD works perfectly. So if some application layer was disturbing, I would bet it would bother in Play and Record as well.
CONCLUSION : Unless someone can prove it (and I'm ready for some testing), I still believe there's a harware/driver layer that is faulty in the Toshiba management.
And I don't need to contact the manufacturer, as I AM one of them :)
If you are part of the Toshiba support, let me know. Maybe we can investigate together.
FYI : I had to create a new user ID for this forum as it did not accept the one I created this morning anymore :(
Thanks anyway.

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