waking system up using RTC (was Re: rtcwakeup.c)

Pavel Machek
2006-08-26T14:59:20Z

Hi!

> > p.s. A followup message will include a userspace program which
> > makes it easier to try the RTC wakeup mechanism.
>
> For example, if your system actually supports RTC wakeup correctly:
>
>         rtcwake -t $(date -u -d 'tomorrow 6:30am' +'%s') -m mem
>
> will set up the system to wake up tomorrow at 6:30am, then suspend-to-RAM by
> writing "mem" to /sys/power/state.
>
> Or for testing kernels, unattended scripts like this may help:
>
>         while true
>         do
>                 echo "suspend-to-disk for 10 minutes starting $(date)"
>                 rtcwake -s $((10 * 60)) -m disk
>                 sleep 500
>         done
>
> If there are many RTC utilities out there that aren't x86-specific, I didn't
> happen to find them. Ergo this one.

Your new RTC driver seems to work for me (thinkpad x60), but no, I
can't get wakeup using RTC to work:

root@amd:~# echo HDEF > /proc/acpi/wakeup
root@amd:~# cat /proc/acpi/wakeup
Device Sleep state Status
LID 3 * enabled
SLPB 3 * enabled
DURT 3 enabled
EXP0 4 enabled
EXP1 4 enabled
EXP2 4 enabled
EXP3 4 enabled
PCI1 4 enabled
USB0 3 enabled
USB1 3 enabled
USB2 3 enabled
USB7 3 enabled
HDEF 4 enabled
root@amd:~# sync
root@amd:~# sync; /tmp/rtcwake -s $((2 * 60)) -m disk
rtcwake: wakeup from "disk" using rtc0 at Sun Aug 27 16:54:49 2006
root@amd:~#

Any ideas? (I tried suspending to RAM, too; no change).

Is acpi-rtc code likely to be merged?