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Groups > linux.debian.user > #270515

How to use /etc/adjtime

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I have a machine whose RTC clock is drifting significantly and it is
often suspended for several days.  I run NTP so the drift I see when
I wake the machine up gets fixed by "stepping" the clock after a while,
but that can take a while and I'd like to improve this
intermediate situation.

The /etc/adjtime is supposed to be there for such purposes but it seems
to be mostly unused: I assume its "UTC" setting is respected but the
first and second lines indicate it has not been updated since 2015
(i.e. when that Debian install was used in another machine).

I have two questions:

- How can I get Debian to use this file when waking up the machine from
  suspend (which would presumably change the file by updating the first
  line's "last adjust time")?

- How can I get `ntpd` to adjust the first line's "drift factor" when it
  steps the clock?

The second question is less important (I can write the drift factor by
hand, e.g. in case `ntpd` is not being told when the clock is (re)set
based on the RTC, making it impossible for it to compute a drift factor).


        Stefan

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Thread

How to use /etc/adjtime Stefan Monnier <monnier@iro.umontreal.ca> - 2024-06-27 18:50 +0200
  Re: How to use /etc/adjtime <tomas@tuxteam.de> - 2024-06-27 19:10 +0200
    Re: How to use /etc/adjtime Stefan Monnier <monnier@iro.umontreal.ca> - 2024-06-28 15:50 +0200
  Re: How to use /etc/adjtime David Wright <deblis@lionunicorn.co.uk> - 2024-06-28 04:30 +0200
    Re: How to use /etc/adjtime Stefan Monnier <monnier@iro.umontreal.ca> - 2024-06-28 15:50 +0200
      Re: How to use /etc/adjtime Greg Wooledge <greg@wooledge.org> - 2024-06-28 16:10 +0200
        Re: How to use /etc/adjtime David Wright <deblis@lionunicorn.co.uk> - 2024-06-28 16:40 +0200
        Re: How to use /etc/adjtime John Hasler <john@sugarbit.com> - 2024-06-28 16:50 +0200
          Re: How to use /etc/adjtime David Wright <deblis@lionunicorn.co.uk> - 2024-06-28 17:10 +0200
            Re: How to use /etc/adjtime John Hasler <john@sugarbit.com> - 2024-06-28 18:20 +0200
              Re: How to use /etc/adjtime David Wright <deblis@lionunicorn.co.uk> - 2024-06-28 21:10 +0200
                Re: How to use /etc/adjtime John Hasler <john@sugarbit.com> - 2024-06-28 22:10 +0200
                Re: How to use /etc/adjtime David Wright <deblis@lionunicorn.co.uk> - 2024-06-30 06:50 +0200
                Re: How to use /etc/adjtime <tomas@tuxteam.de> - 2024-06-29 07:00 +0200
                Re: How to use /etc/adjtime David Wright <deblis@lionunicorn.co.uk> - 2024-06-30 06:50 +0200
          Re: How to use /etc/adjtime Stefan Monnier <monnier@iro.umontreal.ca> - 2024-06-28 20:50 +0200
            Re: How to use /etc/adjtime Max Nikulin <manikulin@gmail.com> - 2024-06-29 03:30 +0200
        Re: How to use /etc/adjtime Stefan Monnier <monnier@iro.umontreal.ca> - 2024-06-28 20:40 +0200
          Re: How to use /etc/adjtime Greg Wooledge <greg@wooledge.org> - 2024-06-28 21:00 +0200
            Re: How to use /etc/adjtime David Wright <deblis@lionunicorn.co.uk> - 2024-06-28 21:50 +0200
            Re: How to use /etc/adjtime Stefan Monnier <monnier@iro.umontreal.ca> - 2024-06-28 22:00 +0200
              Re: How to use /etc/adjtime Greg Wooledge <greg@wooledge.org> - 2024-06-28 22:30 +0200
                Re: How to use /etc/adjtime Stefan Monnier <monnier@iro.umontreal.ca> - 2024-06-28 23:10 +0200
                Re: How to use /etc/adjtime David Wright <deblis@lionunicorn.co.uk> - 2024-06-29 02:10 +0200
  Re: How to use /etc/adjtime Charles Curley <charlescurley@charlescurley.com> - 2024-06-29 06:00 +0200
    Re: How to use /etc/adjtime Charles Curley <charlescurley@charlescurley.com> - 2024-06-29 18:50 +0200

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