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authorPavel Machek <pavel@ucw.cz>2015-01-26 14:43:04 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-01-30 01:29:46 +0100
commita03ff6f20c396fb84cf61501a31fefdf0a5eb5a7 (patch)
tree92fc39aab529603357b5c7aa26b9bc55fa35a5e7 /Documentation/power
parentd78cb3680c8e95c100d5a351b8cfc7dd3c589b68 (diff)
PM / sleep: Mention async suspend in PM_TRACE documentation
Document pm_tracing actually affecting suspend in non-trivial way. Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/power')
-rw-r--r--Documentation/power/s2ram.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/power/s2ram.txt b/Documentation/power/s2ram.txt
index 1bdfa0443773..4685aee197fd 100644
--- a/Documentation/power/s2ram.txt
+++ b/Documentation/power/s2ram.txt
@@ -69,6 +69,10 @@ Reason for this is that the RTC is the only reliably available piece of
hardware during resume operations where a value can be set that will
survive a reboot.
+pm_trace is not compatible with asynchronous suspend, so it turns
+asynchronous suspend off (which may work around timing or
+ordering-sensitive bugs).
+
Consequence is that after a resume (even if it is successful) your system
clock will have a value corresponding to the magic number instead of the
correct date/time! It is therefore advisable to use a program like ntp-date

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