[nogridbag]

I believe Linux does not support the "modern standby" sleep state: S0 which allows PCs to behave like your smartphone.

It's probably more of a problem with the hardware manufacturers than Linux, but regardless the end result is that it only works on Windows.

For example, my Surface Book, when it's working, resumes instantly.

[v_lisivka]

It looks like you right: sleeping in S0 is not supported by Linux, only Windows does this:

ACPI Sleep States (S0 - S5)

•S0: Normal Powered-On state

•S1 Standby

•S2: Not supported

•S3 Suspend to Ram

•S4 Suspend to Disk