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Find out what's keeping your Mac awake
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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