By default, recent Macs ship with their hibernate mode set such that when your Mac goes to sleep, contents of the RAM remain stored in the powered-on RAM in addition to written to the hard disk. The is called safe sleep mode because in the event that your computer loses power during sleep, the contents of the RAM can be read from the hard disk where they were dumped before sleep.
This is why it is possible to change your battery while your MacBook is sleeping with this default sleep mode. I’ve gotten in the habit of immediately putting my MacBook Air to sleep by shutting the lid, by far the easiest method if you’re on the go. Typically this works without a hitch, but today the Air didn’t sleep when shut. You can also try to delete the preferences for Energy Saver, they will be reset by SMC anyway.
You started this thread out as a sleep problem. The BT problem is (or may be) totally unrelated. But while on the subject of BT, if smc and pram resets don’t work then the last ditch effort to fix BT I always recommend is a bluetooth “factory reset”.
Maybe the sleep problem should be addressed before going through all that since you would need to install xcode if you don’t have it. Of course if you already have xcode you go go through the procedure.
Of course it’s back to square one. Why is sleep failing? And at the moment I don’t have an answer considering you said it was working and you haven’t installed anything between the time it worked and failed.
Because the MacBook Air has no moving hard drive or sleep light, I didn’t notice this until I went to use it again about two hours later when I found the machine to be unusually hot to the touch because it never slept as intended. From there on it became a repeatable occurrence, and while I’m not sure of the cause, the solution was just a matter of resetting the SMC:
- Shut down the MacBook Air
- Connect the MagSafe adapter
- Hold down Shift+Control+Option+Power at the same time
- Release all keys at the same time, then hit the power button again to turn the MacBook Air on
The key sequences for an SMC reset are highlighted below, this is specific to the MacBook Air but would also work on the newer MacBook models:
You’ll know the SMC has reset because the MagSafe light flicks on and off, and once you boot up, your MacBook Air should sleep normally again.
SmartSleep let’s you select each select sleep state. Additionaly the new SmartSleep state lets your notebook just sleep while the battery has a high level. Ironically, I had the opposite problem earlier in the year where the MacBook Air wouldn’t wake from sleep.
Via osxdaily and paulstamatiou
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