True but you can enable it on some laptops by telling the firmware setup that your OS is Linux. I'm not sure what Linux S2idle is in ACPI lingo, but that's what Linux uses on my newest lapop by default. S3 (suspend-to-RAM) is not available to the kernel. And yet it's a power hog compared to just not using the laptop and letting the display backlight turn off, roughly 1% battery life loss per hour in S2idle. Whereas it's about 0.5% battery life loss per hour in whatever Windows 10 is doing for laptop lid close.