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Device fails on 15" powerbook....

Hello,

I am having a few users beta test my new high speed bus-powered USB device intended to run only on the mac. During testing one user has found that the device fails when he attempts to run the device on his brand new 15" powerbook on battery power. He can literally have the device functioning perfectly on DC power, and then pull the plug and then it fails. What is confusing is that I've done all the development for this device on a new 1.67Ghz 17" Powerbook, and on the 17" it works fine, with or without DC power. I can unplug the power while the device is running and I don't have any trouble at all.

Is there any difference between the supplied power on the USB ports of the powerbooks while on battery power? I thought they where all rated up to 500ma and nothing should change when on battery power. He has the same problem if he connects the device while the computer is already on battery power.

I'm in the process of having him do more tests to find out exactly how it fails, but i figured someone here might be able to help if this is a hardware spec issue.

Thanks,
Juan
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