Macbook Pro turning off in sleep mode

high sierramacbook prosleep-wake

Since upgrading to the latest MacOS my Macbook Pro seems to be turning off while in sleep mode if left for a long time, I think only when it's not plugged in.

If I close the lid and open it up in about 10 mins, it'll come out of sleep as expected and ask for my password. However if I close the lid and leave it for a few hours, I need to press the power button to boot it back up again asks for HDD encryption password and then prompts to log in.

I have tried resetting the NVRAM and SMC but no luck. There are no further MacOS updates.

Any idea what else I can try?

Best Answer

My iMac began shutting down at random in sleep mode. As it was 6 years old I assumed that the power supply was packing up causing overheating and shut down.

Was about to rush out and buy a new one but had a specialist look at it first. It turned out to be software, freebie malware and avast. Once removed machine runs fast,like new, and doe not shut down. Object lesson look before you leap!

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MacBook – Why won’t the MacBook Pro automatically sleep

To help debug sleeping issues, try the pmset command in the terminal:

$ pmset -g assertions

Assertion status system-wide:
   ChargeInhibit                           0
   PreventUserIdleDisplaySleep             0
   PreventUserIdleSystemSleep              1
   NoRealPowerSources_debug                0
   CPUBoundAssertion                       0
   EnableIdleSleep                         1
   PreventSystemSleep                      0
   DisableInflow                           0
   DisableLowPowerBatteryWarnings          0
   ExternalMedia                           0

Listed by owning process:
  pid 2520: [0x0000012c000009d8] PreventUserIdleSystemSleep named: "com.apple.audio.'AppleHDAEngineOutput:1B,0,1,2:0'.noidlesleep"

In this case, it's the process 2520 messing up. Check it out in activity monitor and kill it (/usr/sbin/coreaudiod started by iTunes).

After that, run the command again:

Assertion status system-wide:
   ChargeInhibit                           0
   PreventUserIdleDisplaySleep             0
   PreventUserIdleSystemSleep              0
   NoRealPowerSources_debug                0
   CPUBoundAssertion                       0
   EnableIdleSleep                         1
   PreventSystemSleep                      0
   DisableInflow                           0
   DisableLowPowerBatteryWarnings          0
   ExternalMedia                           0

No flags for PreventUserIdleSystemSleep.

MacBook – Keeping MacBook Pro on Sleep Mode for days

This is pretty close to my typical MacBook Air usage. Luckily, it seems that we're on track:

For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her notebook on the train, then plugs it in at the office to charge. This keeps the battery juices flowing.

See Apple's page on laptop batteries for lots more information: apple.com

Keep in mind that MacBook batteries are estimated to live through around 1000 charge-discharge cycles before their max capacity drops to 80% (same source). Try to approximate the ideal scenario Apple describes, and avoid running the battery to near-zero between every charge.

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MacBook – Why won’t the MacBook Pro automatically sleep

MacBook – Keeping MacBook Pro on Sleep Mode for days

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