I had a wake-up event at about 2:30 a.m. last night, so checked the Console logs. I found the following messages:
5/12/12 2:33:12.000 a.m. kernel[0]: Previous Sleep Cause: 5
5/12/12 2:33:12.000 a.m. kernel[0]: The USB device HubDevice (Port 1 of Hub at 0xfa000000) may have caused a wake by issuing a remote wakeup (2)
5/12/12 2:33:12.000 a.m. kernel[0]: The USB device BRCM2046 Hub (Port 1 of Hub at 0xfa100000) may have caused a wake by issuing a remote wakeup (3)
5/12/12 2:33:12.000 a.m. kernel[0]: TBT W (1): 0 [x]
5/12/12 2:33:12.000 a.m. kernel[0]: The USB device Bluetooth USB Host Controller (Port 1 of Hub at 0xfa110000) may have caused a wake by issuing a remote wakeup (3)
5/12/12 2:33:12.000 a.m. kernel[0]: 215223.994194: performCountryCodeOperation: Not connected, scan in progress[0]
5/12/12 2:33:12.000 a.m. kernel[0]: HID tickle 315 ms
5/12/12 2:33:12.907 a.m. hidd[46]: MultitouchHID: device bootloaded
.... followed by lots more messages, including a Time Machine backup within less than a minute.
The hub at 0xfa110000 shows up as follws in the System Profile:
BRCM2046 Hub:
Product ID: 0x4500
Vendor ID: 0x0a5c (Broadcom Corp.)
Version: 1.00
Speed: Up to 12 Mb/sec
Manufacturer: Apple Inc.
Location ID: 0xfa110000 / 4
Current Available (mA): 500
Current Required (mA): 0
Bluetooth USB Host Controller:
Product ID: 0x8215
Vendor ID: 0x05ac (Apple Inc.)
Version: 2.01
Serial Number: 442A60D04035
Speed: Up to 12 Mb/sec
Manufacturer: Apple Inc.
Location ID: 0xfa111000 / 6
Current Available (mA): 500
Current Required (mA): 0
I wasn't able to discover what the Hub at 0xfa000000 is, but the rest of it suggests that a Bluetooth device may have caused the wake-up, and I do have that option enabled in my system preferences. I have a Bluetooth keyboard and magic mouse from Apple, and a bluetooth numeric keypad from a third party, but don't know which of these (if any) initiated the wake-up.
A curious thing is that there was an identical event at exactly the same time the previous night. The logs don't go back far enough to see whether it happens every night or not.
Of course I could disable bluetooth devices from waking up the computer, and see if that stops the problem. But if I do that, I don't know of any other way I can get the computer to wake up when I want it to. Any suggestions here?
Thanks for any help.