PM: Add a switch for disabling/enabling asynchronous suspend/resume

[sfrench/cifs-2.6.git] / Documentation / ABI / testing / sysfs-power

diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power
index dcff4d0623add0e7708c642d0cfe210b0c1f48ab..d6a801f45b484e4df433ff09e85a6f3bc07707d5 100644 (file)
--- a/Documentation/ABI/testing/sysfs-power
+++ b/Documentation/ABI/testing/sysfs-power
@@ -101,3 +101,16 @@ Description:
 
                CAUTION: Using it will cause your machine's real-time (CMOS)
                clock to be set to a random invalid time after a resume.
+
+What:          /sys/power/pm_async
+Date:          January 2009
+Contact:       Rafael J. Wysocki <rjw@sisk.pl>
+Description:
+               The /sys/power/pm_async file controls the switch allowing the
+               user space to enable or disable asynchronous suspend and resume
+               of devices.  If enabled, this feature will cause some device
+               drivers' suspend and resume callbacks to be executed in parallel
+               with each other and with the main suspend thread.  It is enabled
+               if this file contains "1", which is the default.  It may be
+               disabled by writing "0" to this file, in which case all devices
+               will be suspended and resumed synchronously.