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| author | Sebastian Capella <sebastian.capella@linaro.org> | 2013-08-26 21:54:49 (GMT) |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2013-08-27 08:44:52 (GMT) |
| commit | 1c93669929f0f52e7033c6529274dce8cc46a9a1 (patch) | |
| tree | 635ff99106d55a086483908ebbb3dfea848e90fc /Documentation/power/swsusp.txt | |
| parent | 9ed354b732689c9dbff6820ce57196e7e499c1fc (diff) | |
| download | linux-1c93669929f0f52e7033c6529274dce8cc46a9a1.tar.xz | |
PM / Hibernate: add section for resume options
Expand the existing documentation to explicitly list the options for
resuming a hibernation image, including the manual resume option which
can be used from the initrd or initramfs and the kernel init resume.
Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'Documentation/power/swsusp.txt')
| -rw-r--r-- | Documentation/power/swsusp.txt | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt index 0b4b63e..079160e 100644 --- a/Documentation/power/swsusp.txt +++ b/Documentation/power/swsusp.txt @@ -50,6 +50,19 @@ echo N > /sys/power/image_size before suspend (it is limited to 500 MB by default). +. The resume process checks for the presence of the resume device, +if found, it then checks the contents for the hibernation image signature. +If both are found, it resumes the hibernation image. + +. The resume process may be triggered in two ways: + 1) During lateinit: If resume=/dev/your_swap_partition is specified on + the kernel command line, lateinit runs the resume process. If the + resume device has not been probed yet, the resume process fails and + bootup continues. + 2) Manually from an initrd or initramfs: May be run from + the init script by using the /sys/power/resume file. It is vital + that this be done prior to remounting any filesystems (even as + read-only) otherwise data may be corrupted. Article about goals and implementation of Software Suspend for Linux ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -326,7 +339,7 @@ Q: How can distributions ship a swsusp-supporting kernel with modular disk drivers (especially SATA)? A: Well, it can be done, load the drivers, then do echo into -/sys/power/disk/resume file from initrd. Be sure not to mount +/sys/power/resume file from initrd. Be sure not to mount anything, not even read-only mount, or you are going to lose your data. |