On Mon, Jul 24, 2006 at 11:40:40PM +0200, Rafael J. Wysocki wrote: > Hi, > > I wrote something about integrating s2disk with powersaved (appended). > Please have a look. [I've already seen that SUSE 10.1 uses the same > mechanism, so this seems to apply to it either.] > > I'd like to add it to the package as a "miscellaneous" document.
It looks good, however i'd like Holger's comment if it is a good idea to replace the do_suspend_to_disk action, since it might do some additional stuff (ignoring button events after resume comes to my mind) or if we should just advise to hack /usr/lib/powersave/do_acpi_sleep, where the stuff is handled now also in a shell script but it might have a special handling around it. > Greetings, > Rafael > > > -- > Integration of s2disk/resume with existing setups > > I. s2disk integration with powersaved on SUSE 10.0 > > SUSE 10.0 contains the powersaved demon responsible for many tasks > related to power management. In particular it can handle suspend-to-disk > requests either explicit, for example from the kpowersave desktop applet, > from a "suspend button", from the keyboard etc., or implicit, for example > related to the notebook battery running critical. Thus if you have installed > s2disk on your SUSE 10.0 system, you may want powersaved to use it for > suspending to disk. > > For this purpose you need to edit the /etc/sysconfig/powersave/events file in > which the actions performed by powersaved when it is asked to suspend the > system to disk are defined. Namely, find the variable > EVENT_GLOBAL_SUSPEND2DISK in this file and observe that by default it is equal > to "prepare_suspend_to_disk screen_saver do_suspend_to_disk". This means > that by default, when a suspend-to-disk request is made, powersaved will first > run the script prepare_suspend_to_disk from /usr/lib/powersave/scripts/ which > may, among other things, unload some kernel modules that are known to cause > problems during suspend or resume. Next, it will start the screen saver and > finally, it will ask the kernel to carry out the suspend to disk. This last > action is represented by "do_suspend_to_disk" and we would like to change it > to > something that will call s2disk instead. Moreover, if s2disk is configured to > use the RSA encryption for protecting keys, we may want to get rid of the > "screen_saver" action which is redundant in such a case. > > In order to make powersaved use s2disk instead of the "do_suspend_to_disk" > action, we need to create a special script and place it in > /usr/lib/powersave/scripts/. The fastest way of doing this is to take > > /usr/share/doc/packages/powersave/contrib/example_event_script > > replace the lines > > echo "i am a custom event script and pollute the syslog." | logger > $LOGGER "i can even do some more sophisticated logging" > DEBUG "and even depending on the DEBUG variable!" WARN > > in it with > > /usr/local/sbin/s2disk > > (where we assume the s2disk binary is in /usr/local/sbin) and save it under a > different name, eg. s2disk_script, in /usr/lib/powersave/scripts/. Of course, > we also have to change the new script's access rights so that powersaved can > actually execute it, eg. by doing > > # chmod a+x /usr/lib/powersave/scripts/s2disk_script > > Now, we can change the value of EVENT_GLOBAL_SUSPEND2DISK in > /etc/sysconfig/powersave/events to the following: > > "prepare_suspend_to_disk screen_saver s2disk_script" > > or, if we don't want the screen saver to be started before the suspend, to > the following: > > "prepare_suspend_to_disk s2disk_script" > > Now, it is only necessary to restart powersaved and we are done. -- Stefan Seyfried | "Please, just tell people QA / R&D Team Mobile Devices | to use KDE." SUSE LINUX Products GmbH, Nürnberg | -- Linus Torvalds ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Suspend-devel mailing list Suspend-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/suspend-devel
