It relates to either the power plan you have setup in windows.
Or the fact that in the bios settings for your motherboard.
You have not enabled power management relating to power saving or the settings, being set for suspend or sleep mode.
In the bios you will have a set of modes in the section of it listed for power or power management.
Acpi inside there are settings we call S or sleep state modes.
S1 to S5.
Each set of numbers refers to how the system shuts down and enters sleep mode.
For example.
S1-S3 suspend all operation and power to the cpu motherboard and other hardware, signal to enter a low power state mode for sleep or suspend.
But keep power to the ram or memory modules to store the data contained in it for fast resume of the system when waking from suspend or sleep mode.
To avoid the windows power error message you must set an S mode in the bios.
Bellow is a wiki link that explains what each power S mode does if set.
Just have a quick read of it it relating to S mode settings.
https://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface
Or read bellow.
S1, Power on Suspend (POS): Processor caches are flushed, and the CPU(s) stops executing instructions. The power to the CPU(s) and RAM is maintained. Devices that do not indicate they must remain on may be powered off.
S2: CPU powered off. Dirty cache is flushed to RAM.
S3, commonly referred to as Standby, Sleep, or Suspend to RAM (STR): RAM remains powered.
S4, Hibernation or Suspend to Disk: All content of the main memory is saved to non-volatile memory such as a hard drive, and the system is powered down.
G2 (S5), Soft Off: G2/S5 is almost the same as G3 Mechanical Off, except that the power supply unit (PSU) still supplies power, at a minimum, to the power button to allow return to S0. A full reboot is required. No previous content is retained. Other components may remain powered so the computer can "wake" on input from the keyboard, clock, modem, LAN, or USB device.
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