Iphone charging on late 2012 iMac

[streetfoldsfive]

I have a late 2012 27inch imac. While it is asleep if i plug a device in it does not start charging until the computer wakes up. Also when I plug my iPhone in at night I put the computer to sleep when I wake up the computer is running sometimes and looks like the iPhone was unplugged and plugged back in. Any ideas mates?

 

[old-wiz]

The Mac doesn't produce enough power to the USB ports when sleeping to start charging a device. I don't even both to try to charge via the usb ports - I always charge with the little wall charger.

If you have iTunes running and plug in the iPhone it will start charging and continue charging even when the computer sleeps.

 

[Confuzzzed]

Clearly the machine is defective and will probably go on to develop image retention issues and yellow tint. Send it back immediately

 

[nitroglicerino]

The Mac doesn't produce enough power to the USB ports when sleeping to start charging a device. I don't even both to try to charge via the usb ports - I always charge with the little wall charger.

If you have iTunes running and plug in the iPhone it will start charging and continue charging even when the computer sleeps.

I don't understand, You said the iMac doesn't produce enough power when sleeping, but it does if iTunes is running?

 

[old-wiz]

I don't understand, You said the iMac doesn't produce enough power when sleeping, but it does if iTunes is running?

I'm not sure if I explained it right... It has something to do with how the usb ports work when system sleeps. However, a search will find other people dealing with the same issue - I had a thread on it where someone told me it will keep charging during sleep if you start charging while awake.

I used to know the details of the firmware but since I retired I lost touch.