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authorUwe Geuder <linuxkernel2015-ugeuder@snkmail.com>2015-06-29 23:35:05 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-07-07 01:18:11 +0200
commitb51f9b103f58db2c5c0a20d6cee26c8bc255d3ae (patch)
tree1f7a614cccf7181d973e8b9b0b8c362ad6fd3fe8 /Documentation
parentd770e558e21961ad6cfdf0ff7df0eb5d7d4f0754 (diff)
downloadlinux-stericsson-b51f9b103f58db2c5c0a20d6cee26c8bc255d3ae.tar.gz
PM / hibernate: clarify resume documentation
it was not the whole truth that kernel mode cannot be used with swap on LVM Signed-off-by: Uwe Geuder <linuxkernel2015-ugeuder@snkmail.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/power/swsusp.txt13
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index f732a8321e8a..8cc17ca71813 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -410,8 +410,17 @@ Documentation/usb/persist.txt.
Q: Can I suspend-to-disk using a swap partition under LVM?
-A: No. You can suspend successfully, but you'll not be able to
-resume. uswsusp should be able to work with LVM. See suspend.sf.net.
+A: Yes and No. You can suspend successfully, but the kernel will not be able
+to resume on its own. You need an initramfs that can recognize the resume
+situation, activate the logical volume containing the swap volume (but not
+touch any filesystems!), and eventually call
+
+echo -n "$major:$minor" > /sys/power/resume
+
+where $major and $minor are the respective major and minor device numbers of
+the swap volume.
+
+uswsusp works with LVM, too. See http://suspend.sourceforge.net/
Q: I upgraded the kernel from 2.6.15 to 2.6.16. Both kernels were
compiled with the similar configuration files. Anyway I found that