This is the default behavior when Standby isn't enabled on a Mac. The system will NOT "Sleep". Sleep mode requires that the RAM be powered up in order to maintain a current snapshot of what's running on the machine. By default, the system will wake up at I think 5-10% battery and shut itself all the way down. If the hibernation mode is set to 3 and you enable Standby, this shutdown should not happen. These settings are all changable and verifiable via the PMSET command in Terminal.
But since when? I have never had to enable anything via Terminal or anywhere else before - it's always been default behaviour. I've been using Macs since the early nineties. And have worked on pretty much every model made up to the 2010 models and every operating system. I did run the pmset command in Terminal earlier though, and I'm quite certain that hibernation mode was set to 3 - not sure about Standby being enabled - and not sure how to do it either. One of the reasons I use Macs, not peecees, is because I'm not really interested in having to program a computer do a job it's always done before, lol. Sleep settings for both display and hard drive have been set in the Energy Saver preferences - but those settings have never been associated with the battery's discharge settings before.
Do you know how to enable the standby mode via terminal? And thanks for your input.
You said "old Powerbooks". That's completely different hardware than the MBPs you have now. Unless you're going to tell me that your MBP (when you got it) behaved that same way and you've done no updates to its software that could have changed this behavior, etc. then you're not comparing Apples to Apples. (yes, pun intended).
sudo pmset standby 1 to enable standby, but before you do that, do a pmset -g and copy/paste the results into a post on here. Let's see what you have right now before we go changing things needlessly.
Hi again. Sorry for the very long delay - the mac went splatt for a while and I'm just getting it back up and running now.
I did what you suggested - here are the results of typing "pmset -g"...
Battery Power -1
AC Power -1*
Currently in use:
I have been going through other posts regarding this and found this Apple article that confirms that the MacBook Pro like my "old" Powerbook (the model listed below and all powerbooks before it) should indeed go to sleep when the battery is drained...
PowerBook G4 (15-inch Double-Layer SD), MacBook (all models), and MacBook Pro (all models)
The battery calibration for the PowerBook G4 (15-inch Double-Layer SD) and any model of MacBook or MacBook Pro has been updated because of a new battery released with this computer. With these computers, follow these steps to calibrate your battery:
- Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.
- Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in.
- Disconnect the power adapter while the computer still on and start running the computer off battery power. You may use your computer during this time. When your battery gets low, the low battery warning dialog appears on the screen.
- At this point, save your work. Continue to use your computer; when the battery gets very low, the computer will automatically go to sleep.
- Turn off the computer or allow it to sleep for five hours or more.
- Connect the power adapter and leave it connected until the battery is fully charged again.
Tip: When the battery reaches "empty", the computer is forced into sleep mode. The battery actually keeps back a reserve beyond "empty", to maintain the computer in sleep for a period of time. Once the battery is truly exhausted, the computer is forced to shut down. At this point, with the safe sleep function introduced in the PowerBook G4 (15-inch Double-Layer SD) computers, the computer's memory contents have been saved to the hard drive. When power is restored, the computer returns itself to its pre-sleep state using the safe sleep image on the hard drive.