June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Power states
In the ACPI specification, the sleep states are called S-states. Linux supports four sleep states, which are shown in the following table, along with the corresponding ACPI S-state:
|
Linux system sleep state |
ACPI S-state |
Description |
|
freeze |
[S0] |
Stops (freezes) all activity in user space, but otherwise the CPU and memory are operating as normal. The power saving results from the fact that no user space code is being run. ACPI doesn't have an equivalent state: S0 is the closest match. S0 is the state for a running system. |
|
standby |
S1 |
Just like freeze, but additionally takes all CPUs offline except the boot CPU. |
|
mem |
S3 |
Powers down the system and put the memory in the self-refresh mode. Also known as ... |
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