[PATCH][RFC] Documentation/: update hibernation debug documentation

[Chen Yu]

Update the description of test_resume mode for hibernation.

Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
---
 Documentation/power/basic-pm-debugging.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/power/basic-pm-debugging.txt b/Documentation/power/basic-pm-debugging.txt
index b96098c..5f1f228 100644
--- a/Documentation/power/basic-pm-debugging.txt
+++ b/Documentation/power/basic-pm-debugging.txt
@@ -36,6 +36,13 @@ button to make the system resume).
 If neither "platform" nor "shutdown" hibernation mode works, you will need to
 identify what goes wrong.
 
+Besides, if all the modes described above work, "test_resume" mode can be used to
+verify if the snapshot data written to swap device can be successfully restored
+to memory:
+# echo test_resume > /sys/power/disk
+# echo disk > /sys/power/state
+If everything goes well, the system will resume back without BIOSes involved in.
+
 a) Test modes of hibernation
 
 To find out why hibernation fails on your system, you can use a special testing
-- 
2.7.4