For F20, during shutdown is the hwclock updated...

[dcw]

I have done several searches to find this info. I have searched for 
systemd, shutdown, rtc, hwclock and combinations of those key words and 
not found what I was looking for.

For F20, during shutdown is the hwclock updated?
How can I enable/disable that behaviour during shutdown.

Thanks all,

David

[T.C. Hollingsworth]

On Tue, Mar 10, 2015 at 1:26 AM, dwoody5654  wrote:
> I have done several searches to find this info. I have searched for systemd,
> shutdown, rtc, hwclock and combinations of those key words and not found
> what I was looking for.
>
> For F20, during shutdown is the hwclock updated?

No.  systemd systems do not touch the RTC on shutdown:
http://lists.freedesktop.org/archives/systemd-devel/2011-May/002526.html
> How can I enable/disable that behaviour during shutdown.

You could create a systemd unit that executes `hwclock --systohc` on shutdown.

-T.C.

[dcw]

On 03/10/2015 03:52 AM, T.C. Hollingsworth wrote:
> On Tue, Mar 10, 2015 at 1:26 AM, dwoody5654  wrote:
> > I have done several searches to find this info. I have searched for systemd,
> > shutdown, rtc, hwclock and combinations of those key words and not found
> > what I was looking for.
> >
> > For F20, during shutdown is the hwclock updated?
>
> No.  systemd systems do not touch the RTC on shutdown:
> http://lists.freedesktop.org/archives/systemd-devel/2011-May/002526.html

Thanks for the info.
Then I should be able to set the wakealarm to reboot at a specified time 
and shutdown. It would then reboot at the time specified in the rtc. For ex.
     echo 0  > /sys/class/rtc/rtc0/wakealarm
     echo `date -u '+%s' -d '+ 5 minutes'` > /sys/class/rtc/rtc0/wakealarm
     #verify alarm is set
     cat /proc/driver/rtc
     shutdown
The computer never boots up.
In F9 with a small change to the halt init script (halt did update the 
hwclock) the computer would boot as desired.
After reading the link you provided I would expect the above to work in 
F20, but it does not at least not on my computer.

The output from the `cat /proc/driver/rtc` is:
rtc_time    : 10:27:11
rtc_date    : 2015-03-10
alrm_time    : 10:31:27
alrm_date    : 2015-03-10
alarm_IRQ    : yes
alrm_pending    : no
update IRQ enabled    : no
periodic IRQ enabled    : no
periodic IRQ frequency    : 1024
max user IRQ frequency    : 64
24hr        : yes
periodic_IRQ    : no
update_IRQ    : no
HPET_emulated    : no
BCD        : yes
DST_enable    : no
periodic_freq    : 1024
batt_status    : okay

I am missing something but I cannot figure out what it is.
Any ideas what I have wrong?

Thanks,

David
> > How can I enable/disable that behaviour during shutdown.
>
> You could create a systemd unit that executes `hwclock --systohc` on shutdown.
>
> -T.C.