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Clock time wrong after a crash / random shut down

asked 2014-10-10 03:52:26 +0300

axaq gravatar image

Had this quite often when a crash / random shut down occured. Luckily crashes got rare after installing the "paper fix".

Unfortunately I had a crash short time after the update. The clock time was off by nearly one hour after the crash what I didn't realised until next day when I missed an event in the morning :-(

The wrong clock time problem happened to me quit often also with previous crashes. Some times the clock was off by days.

My network provider doesn't support automatic time updates via GSM. And integrated NTP is not available.

Is a lithium cell connected to the CMOS clock? How could a crash or battery problem change the CMOS clock?

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Same with mine. I once got mails from the future ("in 20 Stunden" in German, funny), so I think it's because a Jolla is a timeless piece of personal device, which can yesterday tell us what tomorrow happened. So, time is relative.

Robomike ( 2014-10-10 15:13:25 +0300 )edit

Ok I saw this too after a crash my phone time was off by 4 minutes but luckily provider has clock sync support so it comes back.

copyninja ( 2014-10-14 12:05:55 +0300 )edit

Clearly Jolla is the phone, The Doctor would use to call the TARDIS. =:o)

Back to topic: I never yet had this problem with mine thanks to the GSM network (Swisscom) supporting time updates.

Venty ( 2014-10-15 10:12:52 +0300 )edit

Time update is not an option for me. I use MEZ continously and never switch to DST and back, personal reasons. Due to synchronizing topics (OwnCloud etc.) I try to keep time zone the same on all devices. Network provider would sabotage me at this point. But I think it shouldn't be that hard to call a public ntp server during startup?

Robomike ( 2014-10-15 12:13:18 +0300 )edit

I've seen this as well today, the date was off by a week

kearnage ( 2014-10-19 00:46:26 +0300 )edit

1 Answer

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answered 2014-10-23 09:19:09 +0300

spiiroin gravatar image

When the phone boots up: system_time = max(rtc_time, last_shutdown_time, release_time_stamp, build_in_minimum)

When the phone makes orderly shutdown: rtc_time = last_shutdown_time = system_time

If there is a sudden reboot / power loss, the latter does not happen and - depending on whether power loss is long enough to cause loss of rtc time - system time ends up taken from:

  • incorrect / out of sync rtc time
  • last shutdown time
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So I do assume that no secondary small battery/cell has been build-in to let the rtc keep running also in case the main battery has been taken out or is empty.

axaq ( 2014-11-02 19:46:37 +0300 )edit

@axaq: Yes, the rtc time does survive brief (few minutes) battery removal. (But the time that it keeps might still be wrong in case of sudden hw reboot)

spiiroin ( 2014-11-03 08:23:59 +0300 )edit
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Asked: 2014-10-10 03:52:26 +0300

Seen: 322 times

Last updated: Oct 23 '14