> -----Original Message-----
> From: Adam Nielsen [mailto:[email protected]]
> Sent: 22 December 2009 23:45
> To: Graham Adams
> Cc: [email protected]
> Subject: Re: Auto wake on Poweredge 2700 ?
>
> > I found this was set to (according to /proc/acpi/alarm) "2009-12-00
> > 00:00:00" . This seems to mean wake up at midnight every day. By
> > changing this to a specific day I can stop the alarm repeating daily
> > but I think it will still repeat monthly because if I try to set it
> > to, say, "2009-11-01 01:01:01" then read it back it returns
> > "2009-12-01 01:01:01", presumably because the RTC chip is one without
> > year and month fields in the alarm. I am going to try to disable the
> > RTC alarm IRQ using the ioctl documented at the rtc(4) man page.
>
> Interesting. Poking around a bit I also discovered this: (for my
> desktop PC which doesn't automatically wake up)
>
> $ cat /proc/driver/rtc
> rtc_time : 09:40:22
> rtc_date : 2009-12-23
> alrm_time : 03:42:25
> alrm_date : ****-**-**
> alarm_IRQ : no
> alrm_pending : no
> 24hr : yes
> periodic_IRQ : no
> update_IRQ : no
> HPET_emulated : yes
> DST_enable : no
> periodic_freq : 1024
> batt_status : okay
>
> Apparently you can configure these values through
> /sys/class/rtc/rtc0/wakealarm, as detailed here:
>
> http://www.mythtv.org/wiki/ACPI_Wakeup#Using_.2Fsys.2Fclass.2Frtc.2Frtc
> 0.2Fwakealarm
>
> Might save you writing some code.
>
> Cheers,
> Adam.
Hello Adam,
Unfortunately /sys/class/rtc does not exist in kernel 2.6.16.
I wrote a program as follows:
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/rtc.h>
main(argc, argv) {
int ior, k = 0;
int fd = open("/dev/rtc", O_RDONLY);
if (fd <= 0) {
puts("open failed");
exit(1);
}
ior = ioctl(fd, RTC_AIE_OFF, &k);
printf("ioctl result was %d\n", ior);
close(fd);
}
But although this seems to run without error "cat /proc/driver/rtc" still shows
"alarm_IRQ: yes" . However, I have just checked another system I have been
setting up and that does show "alarm_IRQ: no", it is possible that while
testing I managed to do something that has disabled it. I need to play around
a bit more to see if I can find out what sequence of commands/actions disabled
it.
I have verified that while the alarm_IRQ is enabled then the system will wake
once a month if, say, "echo '2008-11-23 12:01:01' > /proc/acpi/alarm" is run,
i.e. the year and month values are ignored.
Graham
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