As the electricity bill gets higher and higher I decided to check out Hibernatemode 25 to lower standby wattage.
Hibernatemode 25 stores the ram content to /var/vm/sleepimage and sets the Mac Pro in a semi off state. Front LED is off, USB is off and one can wake the Mac only with the power button.
It takes a bit longer but it draws less current in that state. Also it should not be problematic when power cuts during sleep.
Some more details:
Downsides:
- in my tests Hibernatemode 25 does not work with Big Sur and OpenCore. Kernel Panic into EFI (tested with OCLP 0.51 and BigSur 12.6)
- takes longer to get to sleep and get back on
- takes capacity of the system disk
- without a bootscreen gpu you can't see the status bar when it comes back
why I made the thread: If one has FileVault active (I have it running Mojave) you will _not_ see the FileVault dialog without a bootscreen GPU.
So the master question is: can one enter a FileVault password blindly without a GPU what runs the EFI GUI for FileVault?
Hibernatemode 25 stores the ram content to /var/vm/sleepimage and sets the Mac Pro in a semi off state. Front LED is off, USB is off and one can wake the Mac only with the power button.
It takes a bit longer but it draws less current in that state. Also it should not be problematic when power cuts during sleep.
Some more details:
How to Sleep a Mac and Check Sleep Settings
Mac supports multiple methods of sleep. Some can extend battery life, while others can make entering and leaving sleep faster.
www.lifewire.com
Downsides:
- in my tests Hibernatemode 25 does not work with Big Sur and OpenCore. Kernel Panic into EFI (tested with OCLP 0.51 and BigSur 12.6)
- takes longer to get to sleep and get back on
- takes capacity of the system disk
- without a bootscreen gpu you can't see the status bar when it comes back
why I made the thread: If one has FileVault active (I have it running Mojave) you will _not_ see the FileVault dialog without a bootscreen GPU.
So the master question is: can one enter a FileVault password blindly without a GPU what runs the EFI GUI for FileVault?
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