X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=Documentation%2Fpower%2Fstates.txt;h=42f28b7aaf6b4b4bf5221ef815875ebd475a40b5;hb=dc5aeae4f961ca8ea9511422236d7076585f149a;hp=4416b28630df8d62cbba43e2fedb0cee42d6b3b1;hpb=255bae73b214f143a3c7cc74d4792eb166a10d46;p=mirror_ubuntu-artful-kernel.git

diff --git a/Documentation/power/states.txt b/Documentation/power/states.txt
index 4416b28630df..42f28b7aaf6b 100644
--- a/Documentation/power/states.txt
+++ b/Documentation/power/states.txt
@@ -2,12 +2,26 @@
 System Power Management States
 
 
-The kernel supports three power management states generically, though
-each is dependent on platform support code to implement the low-level
-details for each state. This file describes each state, what they are
+The kernel supports four power management states generically, though
+one is generic and the other three are dependent on platform support
+code to implement the low-level details for each state.
+This file describes each state, what they are
 commonly called, what ACPI state they map to, and what string to write
 to /sys/power/state to enter that state
 
+state:		Freeze / Low-Power Idle
+ACPI state:	S0
+String:		"freeze"
+
+This state is a generic, pure software, light-weight, low-power state.
+It allows more energy to be saved relative to idle by freezing user
+space and putting all I/O devices into low-power states (possibly
+lower-power than available at run time), such that the processors can
+spend more time in their idle states.
+This state can be used for platforms without Standby/Suspend-to-RAM
+support, or it can be used in addition to Suspend-to-RAM (memory sleep)
+to provide reduced resume latency.
+
 
 State:		Standby / Power-On Suspend
 ACPI State:	S1