Re: Strange cabled network fault when rebooting from Windows (any version) into Ubuntu 24

On Mon, 11/17/2025 5:14 AM, Anssi Saari wrote:
> VanguardLH <[email protected]> writes:
> 
>> Anssi Saari <[email protected]> wrote:
>>
>>> Dan Purgert <[email protected]> writes:
>>>
>>>> Win10, 11 have that "FastBoot" thing that mucks with hardware releases
>>>> on "reboot" (win basically goes into hibernate).
>>>
>>> No. Reboot is always reboot, Windows would be completely useless without
>>> that. "FastBoot" aka fast startup happens when shutting down if not
>>> disabled. And it's hibernate without hibernating apps so fairly useless.
>>
>> Actually Fast Starup is a full hibernate (all memory copied into the
>> hyberfil.sys file).
> 
> Source? For example here:
> https://learn.microsoft.com/en-us/windows-hardware/test/weg/delivering-a-great-startup-and-shutdown-experience
> "Starting with Windows 8.x, the default shutdown and restart scenario
> has been updated and named fast startup. Fast startup begins with the
> shutdown process and includes writing data to disk similar to the
> hibernate process. A key difference is that all user sessions (Session
> 1) are logged off and the remaining information is written to the
> hiberfile."
> 
> When user sessions are logged off, all user apps die and so aren't
> written to the hiberfil.sys, which, as I stated, makes this "fast
> startup" fairly useless.
> 

Fast startup changes the start from maybe 15 seconds to 5 seconds (fast machine).
It is intended to get that screen lit up quickly, to impress your friends.
(Some people have boot contests, and they would like this.)

If used to be, you got a fast boot time, by owning a "mighty" processor.
That was the purpose of the boot contest, was to show how you must
have spent a lot of money on the machine. Fast start allows you to cheat.

It's Windows kernel+drivers hibernation, the session is not saved.

During the five second boot, the blob is read in from hiberfil.sys,
and the drivers are warm started (data arrays initialized). If any
new hardware was plugged in, it will eventually be discovered (perhaps
after the desktop has been painted).

But Fast Boot is also a "handcuffs", as it prevents multi-boot.

   Paul