Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1c936699 authored by Sebastian Capella's avatar Sebastian Capella Committed by Jiri Kosina
Browse files

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: default avatarSebastian Capella <sebastian.capella@linaro.org>
Acked-by: default avatarRob Landley <rob@landley.net>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 9ed354b7

Documentation/power/swsusp.txt

+14 −1
Original line number Diff line number Diff line
@@ -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.