Charging iPhone in sleep mode

[comatory]

So I would like a definite answer to this as I'm trying to do some research for an article. I know it is possible to charge iPhone (and I guess iPads and other iDevices) via USB port while in sleep mode however there are some blank spaces to fill.

So far I know:
- old iPods could be charged via Firewire as it provides power even when in sleep
- in order to have iPhone charged in sleep mode you must connect it first and then put the computer in sleep
- I read somewhere that for Macs you need to have 10.5 Leopard. I wonder if there are some "old timers" around (dont be offended as I myself started on Tiger) who can verify this
- for PCs (regular Wintels) you can adjust this setting under Device Manager - USB port - Power Management via USB suspend function. It is however unclear to me if this is only on some laptops/chipsets or if it's version of Windows

I know its kinda weird question but I would like some definitive answers to this. Thanks.

 

[John T]

Iphones etc do not charge when the computer is asleep.

 

[Nermal]

Iphones etc do not charge when the computer is asleep.

I've just tested my 4S and it definitely charges with the computer asleep (Early 2011 MBP).

 

[sammich]

USB power is supplied when the machine is asleep. So your iDevices and other devices will presumably charge too although they will typically wake the host up first before it negotiates the supply of power.

Iphones etc do not charge when the computer is asleep.

They most definitely do on an Intel Mac under OS X. In fact, I think I can charge my iPhone connected through my Apple Keyboard while it's asleep.

 

[John T]

I've just tested my 4S and it definitely charges with the computer asleep (Early 2011 MBP).

Aha! One lives and learns! I stand corrected! I remember in the iPhone 3 days, the computer didn't charge when in sleep mode. I think there was a reference in the instruction manual.

There must have been an upgrade in a later OS.

 

[Mrbobb]

I don't think is the phone, but rather the laptop in question. Does your laptop maintain usb power even when asleep, that's the question.

In the Windows world, this can be configured, I dunno how is this in the mac world. At some point I seem to recall somewhere in the setting saying whether one will be using a usb-connected keyboard, this *may* signal to maintain usb power at all times.