oops. typo correction, below: i wrote: > hal wrote: > > > > Can somebody give me a pointer to some sample code that will wake up a > > suspended system in 5 minutes? I'm assuming there is some way to do this > > using the alarm interrupt from the RTC. > > use: > rtcwake -s 600 -m mem > > to wake the system in 600 seconds, after suspending it to S3. > see the man page -- but other -m options work, including "no", i
i meant to write: "...but NO other -m options work, ... i should also point out that powerd uses rtcwake for its own purposes, so if you want exclusive control, you should disable it. paul > believe. (although, if someone tries it and it does work, i'll > stand corrected.) > > > > > Can somebody confirm that sleep does what I expect on suspended systems? > > > > My expectation is that the sleep timer logically ticks when suspended, > but > > that the system won't get woken up when the sleep timer expires. > > > > For example, suppose my program does a sleep(100), and shortly after that > the > > system suspends. > > > > If the next wakeup is 200 seconds after the start of the sleep, my > program > > should run then (along with whatever caused the wakeup). > > > > Or if the system wakes up after 50 seconds and doesn't suspend again, my > > program should run 100 seconds after it started to sleep. > > i'm afraid not. your sleep will be stretched by the duration of > the suspend. see the following. a 30 second sleep starts at > 15:42:41. the system suspends for 15 seconds, and wakes (that's > where the "+r" gets printed) at 15:43:01 (2 seconds later than it > expected to, btw). the sleep terminates, and prints "sleep > ended" and the date at 15:43:25. that's roughly 45 seconds after > the 30 second sleep started. > > [r...@xo-a7-2a-c8 dev]# touch /var/run/powerd-inhibit-suspend/1 > [r...@xo-a7-2a-c8 dev]# (date; sleep 30; echo sleep ended; date) & > [2] 3122 > Wed Jul 28 15:42:41 GMT 2010 > [r...@xo-a7-2a-c8 dev]# rtcwake -s 15 -m mem; date > rtcwake: assuming RTC uses UTC ... > rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Jul 28 15:42:59 2010 > > +rWed Jul 28 15:43:01 GMT 2010 > [r...@xo-a7-2a-c8 dev]# sleep ended > Wed Jul 28 15:43:25 GMT 2010 > > > =--------------------- > paul fox, p...@laptop.org =--------------------- paul fox, p...@laptop.org _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel