I read here, that there are these available modes of suspend:
ACPI state S1. This state offers minimal, though real,
power savings, while providing a very low-latency transi‐
tion back to a working system. This is the default mode.
ACPI state S3 (Suspend-to-RAM). This state offers signif‐
icant power savings as everything in the system is put
into a low-power state, except for memory, which is
placed in self-refresh mode to retain its contents.
ACPI state S4 (Suspend-to-disk). This state offers the
greatest power savings, and can be used even in the
absence of low-level platform support for power manage‐
ment. This state operates similarly to Suspend-to-RAM,
but includes a final step of writing memory contents to
I use 'sleep' on my laptop all the time instead of shutting it down, but according to the article I read, when I do this it uses "state S1". How would I change this behaviour so that it uses the "state S3" (above)?