From:   Thomas Gleixner <tglx@linutronix.de>
To:     Joel Daniels <jdaniels@sent.com>,
        John Stultz <john.stultz@linaro.org>,
        Stephen Boyd <sboyd@kernel.org>
Cc:     linux-kernel@vger.kernel.org
Subject: Re: Time keeping while suspended in the presence of persistent
 clock drift
In-Reply-To: <b074f506-2568-4506-9557-4a9bc9cbea83@www.fastmail.com>
References: <5af5d2a5-767c-d313-3be6-cb6f426f1980@sent.com>
 <b074f506-2568-4506-9557-4a9bc9cbea83@www.fastmail.com>
Date:   Sat, 11 Dec 2021 14:36:04 +0100
Message-ID: <87wnkbuuuz.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Joel!

On Thu, Dec 09 2021 at 11:06, Joel Daniels wrote:
> I have an x86 laptop whose CMOS (RTC) clock gains an extra 3.75 seconds
> per day that it is suspended (S3) or off. It keeps time quite accurately
> while awake using the TSC clock source. I use the machine about 1 hour
> per day with the machine in the S3 sleep state for the remaining 23
> hours.
>
> The machine is not usually connected to a network and I do not run an
> NTP daemon (though I do not believe this is relevant). When cold

Believe does not help much for analyzing technical problems. :)

Can you please verify that the problem persists with NTP enabled and
synchronized?

Thanks,

        tglx