1

I want my Mac to stay awake on the login screen, but without activating the screen saver.

I have tried a lot to no avail. I have tried to change Energy Saver settings, which only take effect when I'm logged in.

After press Control + Command + Q, these settings no longer apply.

3

You can disable the screen saver on the login window with this command in Terminal:

sudo defaults write /Library/Preferences/com.apple.screensaver loginWindowIdleTime 0

The settings you have in "Energy Saver Settings" are only for the logged in user, whereas the login screen runs in a different context. To change the settings for the login window context, use the command above.

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