IMac has stopped charging via the keyboard USB port when sleeping - why?

I have a 2008 model 2.8GHz iMac with standard size aliminium keyboard. Historically, I have plugged my iPhone in to the USB port of the aliminium keyboard via the standard iPhone cable and when I put the iMac to sleep it continues to charge the iPhone.
However, the keyboard USB port no longer keeps charging the iPhone when I put the iMac to sleep. The USB ports on the back still do, but not those on the keyboard. Has anyone else encountered this and found a solution?

Although I have never connected my iPod to the keyboard in the past, I can confirm this behavior. Previously my Mac was an Early 2006 iMac Core Duo with the white plastic Apple Keyboard, so the USB hub in the keyboard was USB 1.1 and not recommended for iPods. Now I have a new Early 2009 Mac mini with the aluminum Apple Keyboard with Numeric Keypad with the USB 2.0 hub.
I can confirm that, based on the messages/symbols displayed on the iPod;
1. an iPod connected to the USB 2.0 hub in the Apple Keyboard charges when the Mac is awake.
2. an iPod connected to the USB 2.0 hub in the Apple Keyboard is ejected and no longer charges when the Mac is asleep.
3. an iPod connected to a 3rd party, non-powered, USB 2.0 hub connected directly to a Mac USB port is ejected but continues to charge when the Mac is put to sleep.
4. an iPod connected directly to a Mac USB port is ejected but continues to charge when the Mac is put to sleep.
However, Benjamin, if you read the the 3rd comment from the bottom, of the discussion thread to which you have linked, the poster states that Apple engineers have confirmed to him that;
1. with Mac OS X 10.5.6 a new power management scheme was implemented.
2. an iPod connected to the USB 2.0 hub in the Apple Keyboard is ejected and no longer charges when the Mac is asleep, is now correct behavior under the new power management scheme.
The drawback is that folks in that thread are reporting that not only does the iPod not charge, but that it is drained of power.

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