Let's add Paul to CC ;-)
On Wed, Sep 12, 2012 at 09:52:14AM +0000, Giacomo wrote:
> Giacomo <giacomo.perale@...> writes:
>
> > I recently upgraded to util-linux 2.22 and I noticed that powertop started
> > reporting about 50-60 wakeups per second caused by rtc (interrupt 8).
> >
> > I quickly found out that this happened when I used rtcwake to wake up the
> > machine, and that after the reboot /sys/class/rtc/rtc0/wakealarm was still
> > set to the scheduled wakeup time (now in the past).
> >
> > After a quick investigation I discovered that this is caused by commit
> > 1707576155daf644c5df3c1776b52fd297ff9318 ("rtcwake: only invoke RTC_AIE_ON/OFF
> > ioctls in pairs"): my system uses RTC_WKALM_SET so ioctl_aie_on stays false and
> > RTC_AIE_OFF doesn't get called.
> >
>
> Hi,
>
> that commit also broke "disable". This is what happens on my system:
>
> KazeNoTani ~ # cat /sys/class/rtc/rtc0/wakealarm
> KazeNoTani ~ # rtcwake -m show
> alarm: off
> KazeNoTani ~ # rtcwake -m no -s 300
> rtcwake: wakeup using /dev/rtc0 at Wed Sep 12 09:40:31 2012
> KazeNoTani ~ # rtcwake -m show
> alarm: on Wed Sep 12 09:40:32 2012
> KazeNoTani ~ # cat /sys/class/rtc/rtc0/wakealarm
> 1347442831
> KazeNoTani ~ # rtcwake -m disable
> KazeNoTani ~ # rtcwake -m show
> alarm: on Wed Sep 12 09:40:32 2012
> KazeNoTani ~ # cat /sys/class/rtc/rtc0/wakealarm
> 1347442831
> KazeNoTani ~ # echo 0 > /sys/class/rtc/rtc0/wakealarm
> KazeNoTani ~ # cat /sys/class/rtc/rtc0/wakealarm
> KazeNoTani ~ # rtcwake -m show
> alarm: off
>
>
> rtcwake -m disable doesn't remove the alarm. This is because as it is
> implemented now "-m disable" does nothing but break and rely on the call to
> RTC_AIE_OFF that was always done at the end of the execution of rtcwake, but now
> is conditional on "ioctl_aie_on" that doesn't get set in most cases.
>
> Thanks,
>
> Giacomo
>
>
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--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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