Comments on: “smart” suspend in pm-utils

By: Randy Robertson

Randy Robertson — Mon, 30 Mar 2009 08:08:28 +0000

I found this site when looking for “smart suspend” on Linux, but I think what I was looking for is not what you were talking about. What I wanted was a combined suspend/hibernate with a tuneable switchover time which did not pre-emptively write ram to disk. While writing ram out to disk ASAP is nice since you can unplug the battery, on a mobile system this is a waste of power usually.

Here is a link to my blog where I have developed a solution for this. I figured others will probably also find this when searching for smart suspend.

http://www.angrylibertarian.com/node/49

By: Pablo

Pablo — Wed, 07 Jan 2009 12:20:12 +0000

Oops, I see I should get some sleep before I post … here’s the correct `diff -u’ - sorry about that:

ROOT-root@zoom-431-[pm-utils]: diff -u functions.orig functions
— functions.orig 2009-01-07 00:41:04.892007783 -0500
+++ functions 2009-01-07 00:41:08.341129371 -0500
@@ -61,7 +61,7 @@
# on, and it looks better with splashy support
#chvt 63

- if [ -f /.suspended ]; then
+ if [ -s /.suspended ]; then
read pid < /.suspended
if [ -d /proc/$pid ]; then
return 1
ROOT-root@zoom-432-[pm-utils]:

By: Pablo

Pablo — Wed, 07 Jan 2009 05:45:01 +0000

Hi,

My machine stopped suspending (s2ram) and I couldn’t figure it out. I was getting no messages written to the log file. I finally narrowed it down to a empty `/.suspended’ file.

Below is a patch to the `functions’ script (11.1) which checks that the `/.suspended’ file exists and is sized greater than zero.

I’ve tested it on my laptop. Thanks for the great work.

ROOT-root@zoom-489-[pm-utils]: diff -u functions*
— functions 2009-01-07 00:41:08.341129371 -0500
+++ functions.orig 2009-01-07 00:41:04.892007783 -0500
@@ -61,7 +61,7 @@
# on, and it looks better with splashy support
#chvt 63

- if [ -s /.suspended ]; then
+ if [ -f /.suspended ]; then
read pid < /.suspended
if [ -d /proc/$pid ]; then
return 1