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Power Drains from USB 2.0 Port, Powerbook G4

Message #1 - Posted 2004/01/02 - M-M

I have a Zio Compact Flash reader that sometimes will not work on my Powerbook (12", 1 Gig) unless I reboot.

I called Zio tech support and they said the longer the computer is awake, the more power gets drained from the USB port until there is not enough to mount the camera card. The solution is to reboot and that restores power.

That sounds logical since it is indeed not mounting only when the computer has been on for a long time.

My question is, is there another way to restore the power to the USB ports short of rebooting?

tia,

m-m

Message #2 - Posted 2004/01/02 - Mark G. Thomas

On Fri, 02 Jan 2004 14:21:30 GMT, M-M wrote:

I have a Zio Compact Flash reader that sometimes will not work on my Powerbook (12", 1 Gig) unless I reboot.

I called Zio tech support and they said the longer the computer is awake, the more power gets drained from the USB port until there is not enough to mount the camera card. The solution is to reboot and that restores power.

My theory is that the perhaps the Mac reduces power on the USB port to save energy.

That sounds logical since it is indeed not mounting only when the computer has been on for a long time.

My question is, is there another way to restore the power to the USB ports short of rebooting?

I found that running the System Profiler once the Zio is inserted wakes up the port sufficiently for the Zio to then be recognized. Youw will find the System Profiler program in the Utilies folder, or may launch it from the Apple menu under "About this Mac"

Mark

http://www.misty.com/ http://mail-cleaner.com/

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