Arch Linux

Alarming_Thing

Member

Registered: 2021-06-01

Posts: 41

[Solved] BIOS Timing Issue.

Each time I boot Linux (not limited to Arch), Linux seems to reset the BIOS clock to a completely different time zone
Has anyone seen this issue?
I must also add that this is not a bad BIOS issue.  It happens across multiple machines

This is a reproducible issue if anyone is interested.

Last edited by Alarming_Thing (2024-10-08 11:53:43)

skunktrader

Member

From: Brisbane, Australia

Registered: 2010-02-14

Posts: 1,576

Re: [Solved] BIOS Timing Issue.

I assume you've read this

edit: my post made more sense before your edit

Last edited by skunktrader (2024-05-25 02:14:45)

Alarming_Thing

Member

Registered: 2021-06-01

Posts: 41

Re: [Solved] BIOS Timing Issue.

I assume you've read this

Thanks for the link. I hadn't read it.
But larger question is, why does Linux change BIOS time?

-thc

Member

Registered: 2017-03-15

Posts: 685

Re: [Solved] BIOS Timing Issue.

AFAIK the (battery buffered) BIOS time has quite the drift.

Which is why (as you can read here) most OS write their accurate time back to the BIOS on shutdown.

Arch writes UTC time back to the BIOS by default.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,193

Re: [Solved] BIOS Timing Issue.

What is the output of timedatectl   ?
That output includes a timezone.  Please tell us if that is your timezone.

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Alarming_Thing

Member

Registered: 2021-06-01

Posts: 41

Re: [Solved] BIOS Timing Issue.

AFAIK the (battery buffered) BIOS time has quite the drift.

Which is why (as you can read here) most OS write their accurate time back to the BIOS on shutdown.

Arch writes UTC time back to the BIOS by default.

Is it possible to write a time other than UTC?
My problem stems from the fact that Windows uses BIOS time - in spite of asking it to set both tz and time automatically. Hence, each time I reboot from arch into windows, i get UTC

seth

Member

Registered: 2012-09-03

Posts: 58,659

Re: [Solved] BIOS Timing Issue.

I tought you had read https://wiki.archlinux.org/title/System … le_systems ?
Don't run the RTC in local time, change the windows behavior.

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