hibernatemode

To disable hibernation images completely, ensure hibernatemode standby and autopoweroff are all set to 0.

FileVault 2 does support purging keys on sleep: sudo pmset -a destroyfvkeyonstandby 1 hibernatemode 25 From the pmset man page: destroyfvkeyonstandby - Destroy File Vault Key when going to standby mode.

While I'd recommend against it, the command I believe you're looking for is: sudo pmset -a hibernatemode 3 Edit: this does not appear to work correctly on macOS 15?

Benchmarking it shows that with all programs quit and hibernatemode at 25, it takes around 2 seconds to enter RAM-off-sleep and 8 seconds to awaken from it, rather than both happening instantly with RAM-on-sleep.

If the keys are destroyed, user will be prompted to enter the password while coming out of standby mode.(value: 1 - Destroy, 0 - Retain) and hibernatemode = 25 (binary 0001 1001) is only settable via pmset.

I have custom pmset setup to NOT dump to disk (mostly) with two aliases: pmset-fast: sudo pmset -ab hibernatemode 0 sleep 0 pmset-secure: sudo pmset -ab hibernatemode 25 sleep 0 displaysleep 1 First one is memory only, if the battery dies, the battery dies and the OS goes away.

You can also tweak a setting to automatically erase the FileVault key before suspending the laptop, requiring it to be entered before booting back up: pmset -a destroyfvkeyonstandby 1 I use pmset -a destroyfvkeyonstandby 1 hibernatemode 25 to always hibernate the laptop instead of suspending.

I "fixed" it by switching the hibernation mode sleep (hibernatemode 0), suspend-to-disk and suspend-to-ram would kernel panic every time.

Tell the system to forget its key during sleep; the most recent rubber chicken to wave for this appears to be "sudo pmset -a destroyfvkeyonstandby 1 hibernatemode 25".