I have a custom-built computer based on an ASRock motherboard, and both Linux Mint 17.2 and Windows 10 installed.
When I shut down the computer, from either OS, the USB devices remain on. I'd rather they turned off when the computer is off (as they're useless anyway) so I found that the relevant UEFI setting is named "Deep sleep". I switched that setting from "Disabled" to "Enabled on S5" (S5 is the computer's shut down state).
The setting did what I expected, but it had an unintended side effect: With it on both Mint and Windows fail to shut down the computer correctly, and instead seem to "freeze" at the last moment before it would actually shut down. I can only turn it off from that state by holding down the power button.
Why does the above happen? Is there a way to keep the Deep Sleep setting on but make the computer shut down when the OS tells it to?
Describing what happens in more detail:
- On Mint, the screen just shows the Mint logo that appears normally when the OS is starting or shutting down. If I disable splash, the last output from the kernel is "reboot: shutting down".
- On Windows, the screen goes off entirely: The monitor itself displays a "no signal" message.
- In both cases, everything in the computer seems to still be powered, as the cooling fans still work.