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Replies
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5
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1
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Last Post
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Mar 7, 2007 5:41 PM
by: Bernd Kaskas
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Posts:
206
Registered:
Jan 4, 2002
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USB power during sleep?
Posted:
Mar 4, 2007 1:07 PM
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If the PB is plugged into AC and the cover is closed, can the USB port still be used to charge an external device (eg. ipod)?
Thanks
Ken
Intel iMac & PB G4
Mac OS X (10.4.8)
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Posts:
73
Registered:
Oct 13, 2005
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Re: USB power during sleep?
Posted:
Mar 4, 2007 2:24 PM
in response to: Ken Stone
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check on the iPod, when charging the symbol should be visible!
PowerBook G4 1.25 GHz
Mac OS X (10.4.8)
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Posts:
40,056
Registered:
Mar 2, 2001
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Re: USB power during sleep?
Posted:
Mar 4, 2007 7:31 PM
in response to: Ken Stone
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A PowerBook will not supply power over the USB ports when it is asleep, but will over FireWire while it is awake or if the computer is plugged in. If the PowerBook is awake, power will be provided over USB.
(20192)
iMac DV 450
Mac OS 9.2.x
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Posts:
206
Registered:
Jan 4, 2002
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Re: USB power during sleep?
Posted:
Mar 7, 2007 5:08 PM
in response to: Niel
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A PowerBook will not supply power over the USB ports
when it is asleep, but will over FireWire while it is
awake or if the computer is plugged in.
Niel,
So, if the PowerBook is plugged in but cover closed and asleep then the USB port is powered?
Thanks
Ken
Intel iMac & PB G4 Mac OS X (10.4.8)
Intel iMac & PB G4
Mac OS X (10.4.8)
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Posts:
40,056
Registered:
Mar 2, 2001
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Re: USB power during sleep?
Posted:
Mar 7, 2007 5:32 PM
in response to: Ken Stone
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The USB port is not powered on a PowerBook when the computer is asleep. Providing power over USB requires that the CPU be active to arbitrate power requests.
(20247)
iMac DV 450
Mac OS X (10.4.8)
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Posts:
73
Registered:
Oct 13, 2005
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Re: USB power during sleep?
Posted:
Mar 7, 2007 5:38 PM
in response to: Ken Stone
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Hi Ken,
when your powerbook or ibook is in sleeping mode, the USB ports are switched off and are not charging. If you have a FW to iPod cable, this will provide power for charging even if the computer is in sleep mode. This is even so when like with the newer iPods FW cables cannot be used for data transfer. I have just tested this myself using my powerbook and my 5th generation iPod.
Also, you can always check whether your iPod is being charged yourself, by watching the display! If there is this electrical spark symbol visible on top of the battery icon, then it is being charged!
Regards,
Bernard
PowerBook G4 1.25 GHz Mac OS X (10.4.8)
Mac OS X (10.4.8)
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