There are many threads here covering these details: Also, the hardware itself can become faulty or inconsistent even when the software is processing all SMC / environment signals properly and in a timely fashion. They are rare, but do happen from time to time. I have seen times when the OS is blocked enough to not sleep the lid for some time or even some hours when the system was frozen. ![]() The other exception is when the sleep sensor doesn't trigger (or was triggered and dismissed) or the system doesn't process that signal in a timely fashion. The exceptions to locking are when the machine detects that a closed clamshell event has happened (connected to power, USB and an external display) while the system detects the lid closed. I use LaunchBar to lock the screen with key commands and/or sleep the OS. The only way you can be sure is to lock the screen before you close the lid and then close it. ![]() You can't be 100% sure that the display will lock when closing the lid.
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