Re: Charging iPod / Listening to music

Richard Lyons wrote:
> On Wed, Oct 31, 2007 at 08:41:38AM -0400, Douglas A. Tutty wrote:
>

>> On Tue, Oct 30, 2007 at 06:14:49PM -0600, Nate Duehr wrote:
>>> On Oct 30, 2007, at 4:01 PM, Mathieu Malaterre wrote:
>>  
>>>> It works, I can listen to music again, but even if the cable is
>>>> pluged it does not seems to be charging...
>>> That makes sense.  USB devices have to "request" how much power-draw  
>>> they want to pull from the host.  If you kill the "stuff" that talks  
>>> to USB devices, they can't request power.
>> Then how does my USB light get power; surely it doesn't "request" enough
>> power to run an LED?  I can also charge my Palm with the computer off;
>> there's nothing running to receive any "request".

It changes by laptop and chipset manufacturer for the USB host chipset and how they designed the power sub-systems.

I have seen one laptop that leaves the USB ports on in "sleep" mode, but never in "off" mode. I think it was the work IBM/Lenovo, but don't remember.

My Mac turns 'em off in sleep, if I remember correctly. Don't remember what the old eMachine USB 1.0 machine does... and then there's the desktops... they're all over the place.

Nate

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