[Linux-aus] Ubuntu 20.04 resume time problem

John Pearson john at huiac.com
Tue Jun 28 16:30:25 AEST 2022

Haven't been in this position often or for some time, but if the hw clock is set to localtime on a dualboot system then things might get strange when booting an os for the first time after dst starts/ends; one or both will probably feel responsible for adjusting the clock, and neither knows if it's already been done.

NTP should fix it eventually, but until it does TLS and kerberos may have a hard time.


On June 28, 2022 12:15:26 PM GMT+10:00, Russell Coker via linux-aus <linux-aus at lists.linux.org.au> wrote:
>I have a laptop that is dual boot Ubuntu 20.04 and Windows. I've configured it 
>for "RTC in local TZ" with timedatectl so it can have the same time as Windows 
>(I'm aware that I could change Windows via regedit to use UTC for the hwclock 
>but I'm trying to work out the best option for a corporate rollout).  The 
>problem is that I resume from suspend and the system immediately treats the 
>RTC as if it was in UTC thus being out by 10 hours (time zone +1000).
>How does Ubuntu get the time from the RTC on resume? Any clues as to where to 
>look would be really appreciated. I've done Google searches and found nothing 
>helpful. Even if you just know which program does it that would help a lot, I 
>could read the source.
>Before someone says "oh what about the time change at the start/end of DST", 
>for a laptop it's not a big deal as it will probably be in sleep mode then. As 
>timedatectl supports this feature I think it's not unreasonable to expect it 
>to work.
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Sent from my Android device with K-9 Mail. Please excuse my brevity.
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