How to disable Fast Startup using a Group Policy?

It looks like there is no Administrative Template for managing this setting; as documented, Computer Configuration\Policies\Administrative Templates\System\Shutdown\Require use of fast startup can only be used to enforce it, not to disable it (WTF?!? It's already enabled by default... they could at least have gone a bit further and turn this setting into a true on/off switch!).

The only available way to disable Fast Startup (outside of using the GUI) is by setting the following Registry key to 0:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Power\HiberbootEnabled

This can be done using Group Policy Preferences and it effectively disables Fast Startup; of course, setting it to 1 would instead enable it.

And yes, disabling Fast Startup fixes the problem of Wake-On-Lan not working.

I know this is an old post. But I was having the same issues. It does work to just disable hibernation as well. "powercfg -h off"

I agree with Minkus that by Disabling GPO "Computer Configuration\Policies\Administrative Templates\System\Shutdown\Require use of fast startup" does set the registry key

HKLM\SOFTWARE\Policies\Microsoft\Windows\System\HiberbootEnabled=0

(REG_DWORD) but that doesn't seem to Disable Fast Startup in my testing.

It does seem like a bug, since the only way to properly disable "Fast Startup" is setting the Regkey:

HKLM\SYSTEM\CurrentControlSet\Control\SessionManager\Power\HiberbootEnabled=0