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Find out what's keeping your Mac awake
Authored by: mike cupcake on Jul 05, '12 03:37:29AM
MacBookPro8,1 with 10.6.8 here.

On a Macmini4,1 running 10.6.8 server:
thebank:~ administrator$ pmset -g assertions
05/07/2012 11:35:04 GMT+01:00 
Assertion status system-wide:
ChargeInhibit                           0
NoDisplaySleepAssertion                 0
CPUBoundAssertion                       0
EnableIdleSleep                         1
NoIdleSleepAssertion                    1
DisableInflow                           0
DisableLowPowerBatteryWarnings          0
ExternalMedia                           0

Listed by owning process:
  16446: NoIdleSleepAssertion value=255 named: "Time Machine backup"


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Find out what's keeping your Mac awake
Authored by: gpc on Jul 05, '12 09:21:42AM
Ah! I generally don't have my time-machine drive connected. When I plug it in to the USB port, I get this list:
gpc$ pmset -g assertions
7/5/12 11:43:48 AM EDT 
Assertion status system-wide:
ChargeInhibit                           0
NoDisplaySleepAssertion                 0
CPUBoundAssertion                       0
EnableIdleSleep                         1
NoIdleSleepAssertion                    0
DisableInflow                           0
DisableLowPowerBatteryWarnings          0
ExternalMedia                           1

Listed by owning process:
  15: ExternalMedia value=255 named: "com.apple.powermanagement.externalmediamounted" 
So, the same list of assertions, and now one of them is owned by a process (instead of "No Assertions."). When a backup is running:
gpc$ pmset -g assertions
7/5/12 12:02:43 PM EDT 
Assertion status system-wide:
ChargeInhibit                           0
NoDisplaySleepAssertion                 0
CPUBoundAssertion                       0
EnableIdleSleep                         1
NoIdleSleepAssertion                    1
DisableInflow                           0
DisableLowPowerBatteryWarnings          0
ExternalMedia                           1

Listed by owning process:
  15: ExternalMedia value=255 named: "com.apple.powermanagement.externalmediamounted" 
  692: NoIdleSleepAssertion value=255 named: "Time Machine backup" 
So perhaps on this MBP6,2 in 10.6.8 it is NoIdleSleepAssertion that plays the role of the ones mentioned in the hint.

It may be the SMC Version or the Boot ROM that's relevant, rather than the model.

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