sudo pmset -g autopoweroffdelay 14400 (4 hours)ĭon't make too many changes at once and (as used to be recommended) don't change hibernatemode to 25.If you're using a laptop, you'll see 'Battery' and 'Power Adapter' modes. 2 4 Click the mode you want to change the options for. If you don't see this, click the 'Show All' button at the top of the menu. 2 Select 'System Preferences.' 1 3 Click the 'Energy Saver' option. sudo pmset -g standbydelaylow 7200 (2 hours) You can also set a schedule for Sleep mode.sudo pmset -g standbydelayhigh 7200 (2 hours).sudo pmset -b tcpkeepalive 0 to turn off repeated network wakes.We are most interested in those under battery power and can change them with sudo pmset -b.įor my MacBook I drastically reduced overnight battery drain by disabling network wakes and reducing the time before the MacBook goes into deeper sleep states. There are two different sets depending on whether you have mains power connected or just using the battery. in system Preferences, get the current power management parameters with:
#Change sleep time on mac big sur mac#
The first setting keeps your Mac from going to sleep while plugged in unless you explicitly choose > Sleep.
![change sleep time on mac big sur change sleep time on mac big sur](https://www.imore.com/sites/imore.com/files/styles/xlarge/public/field/image/2016/07/downgrade-macos-restart-Mac-screenshot.jpg)
We can control these wakes - in particular, reduce them so that there is less battery drain. Big Sur’s Battery preference pane has a single setting to modify. I do not know a source for a comprehensive or detailed explanation of the descriptions.Ī byproduct of this is that many lines contain the current battery level, which gives us some idea as to how much the regular wakes are draining the battery.
![change sleep time on mac big sur change sleep time on mac big sur](https://support.apple.com/library/content/dam/edam/applecare/images/en_US/macos/Big-Sur/macos-big-sur-system-prefs-security-privacy-unlock-popover.jpg)
Amongst other reasons, these can relate timers or network activity. We can now see the description for each wake. Pmset -g log | egrep "\b(Sleep|Wake*|DarkWake|Start)\s" Whilst we need that for detailed understanding, useful subsets are: pmset -g log | grep -e "Wake from" -e "DarkWake" -e "due to" The detailed log is shown with the Terminal command: To diagnose what is happening we need to inspect the power management log. Note that except for hibernate, the Mac will 'Dark Wake' at intervals. Hibernate - as standby, but everything powered off.Standby - RAM written to disk and RAM and USB powered off.Safe Sleep - RAM has been written to disk (hence safe), but still powered.Sleep - just the lid (on a laptop) closed.My list of sleeping states which is probably not complete and has one question mark: I have found web searches to produce different, often contradictory, descriptions of sleep states. But this is confusing because it mixes superficial description of states with commands which control those states.
![change sleep time on mac big sur change sleep time on mac big sur](https://eshop.macsales.com/blog/wp-content/uploads/2021/04/SleepOrShutdown-1400x788-1.jpg)
There is some description of sleep states in the power management man page. It is not as simple as suggested by the System Preferences Energy Saver choices, nor by this Apple page which makes it seem simple - either sleep or wake.