Not green: No sleep when using integrated card reader and hub in Dell 2709

Hello,
here's a little weird sleep and wake-up problem with a Mac Mini.
I hooked up a Mac Mini Mid 2010 model to a Dell 2709 monitor which has an integrated and self-powered card reader built in and this is connected by USB to the Mac. To the mac this appears correctly as a usb self-powered hub. I am using a so called master/slave power socket to put every periphal to sleep when the Mac enters sleep (stand by) mode. The Mac itself plugs into the Master socket and when turned on it also switches on the Slave sockets, and the monitor. Shutdwon and sleep turns the slaves off. This works good until the monitor USB hub is connected to the Mac. Then, when the Mac enters sleep state, it wakes itself up again within 1-2 seconds. The wake-up reason seems to be the USB hub from the monitor, because the hub looses power due to the master/slave power panel and disconnects from USB, which in turn wakes the Mac up again.
Now, i got also a Bootcamp partition with Windows 7 installed on the same machine. To my surprise this works as expected. It enters sleep state (called StandBy Mode in Windows) without wakening up again immediately by itself. I assume the reason for this different behaviour is just the different approach from the two OS's. OS X wakes up even when disconnecting USB gear, but Windows does not.
It took some hours to find out this. Apparently other users in this forum also have this problem in this particular scenario, like here:
http://discussions.apple.com/thread.jspa?messageID=11031781&#11031781
Unfortunately the topic is unanswered and archived.
What would solve this problem is of course to change the power connection for the monitor in a way that the integrated USB stays powered. That would be pragmatic but not be "green".
Another approach would be to change the behaviour of the Mac to not wake up when a USB device is disconnected - which makes no sense to me personally at all. I'm new to OS X and didn't found any command to achieve this.
Would be nice to make real power saving working again.

Hi David,
thanks for your reply. You mentioned that the hub in the monitor is sending some sort of signal when powered down and this causes the wake up. Good idea. To inspect this i played around a bit with some other different USB gear on the same Mac.
I discovered that any&every device that is disconnected by just unplugging it from the sleeping Mac Mini wakes the computer up again.
This example from the kernel log shows a connected Canon ip4000 printer:
Sep 16 00:26:52 MacMini2010 kernel[0]: AFPSleepWakeHandler: going to sleep
Sep 16 00:26:56 MacMini2010 kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link down on en0
Sep 16 00:26:56 MacMini2010 kernel[0]: System Sleep
Sep 16 00:27:00 MacMini2010 kernel[0]: Wake reason = OHC1 EHC1
Sep 16 00:27:00 MacMini2010 kernel[0]: System Wake
Sep 16 00:27:00 MacMini2010 kernel[0]: Previous Sleep Cause: 5
Sep 16 00:27:00 MacMini2010 kernel[0]: USB (EHCI):Port 4 on bus 0x24 connected or disconnected: portSC(0x101803)
Sep 16 00:27:01 MacMini2010 kernel[0]: The USB device iP4000 (Port 4 of Hub at 0x4000000) may have caused a wake by being disconnected
Sep 16 00:27:02 MacMini2010 kernel[0]: AFPSleepWakeHandler: waking up
OK, this device is also self-powered. But what about a thumb drive?
The same can be reproduced with USB thumb drives (all other USB devices were unplugged before, the Mini was sent to sleep via the power button):
Sep 16 18:16:29 MacMini2010 kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link down on en0
Sep 16 18:16:29 MacMini2010 kernel[0]: System Sleep
Sep 16 18:16:43 MacMini2010 kernel[0]: Wake reason = EHC1
Sep 16 18:16:43 MacMini2010 kernel[0]: System Wake
Sep 16 18:16:43 MacMini2010 kernel[0]: Previous Sleep Cause: 5
Sep 16 18:16:43 MacMini2010 kernel[0]: USB (EHCI):Port 1 on bus 0x24 connected or disconnected: portSC(0x301002)
Sep 16 18:16:43 MacMini2010 kernel[0]: The USB device Cruzer Crossfire (Port 1 of Hub at 0x24000000) may have caused a wake by being disconnected
So, either:
- OS X or the Firmware can not distinguish between connect and disconnect and wakes up the computer at both events. The log above shows the opposite in the last line.
or:
- This behaviour is by design. (But makes no sense for non-block-level devices. Unplugging = Wake-Up?)
or:
- Something with EFI ?
Now i am poking in the dark.
The Unibody-Mini is really a light-sleeper...

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