linux-kernel - Re: [bugreport] "hwclock -w" reset time instead of setting the right time

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Message-ID: <CABXGCsO25iq2tZMis3E-DF2ADz2Je45YfL11cgjFhmr+bz-6jg@mail.gmail.com>
Date:   Sat, 4 Jan 2020 17:23:09 +0500
From:   Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To:     Jinke Fan <fanjinke@...on.cn>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        J William Piggott <elseifthen@....com>,
        Karel Zak <kzak@...hat.com>,
        "util-linux@...r.kernel.org" <util-linux@...r.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>
Subject: Re: [bugreport] "hwclock -w" reset time instead of setting the right time

On Sat, 4 Jan 2020 at 16:37, Jinke Fan <fanjinke@...on.cn> wrote:
>
> Hi Mike:
> Yes, We do check the time in BIOS Menu after first reboot.
>
> We do some further tests in our X570 platform:
> * "AMD Ryzen 7 3700X" with mainboard "ASUS ROG STRIX X570-E GAMING".
> * OS is Fedora rawhide, with default Kernel version which is shown as
> follows:
> $uname -a
> Linux bogon 5.5.0-0.rc4.git0.1.fc32.x86_64 #1 SMP Mon Dec 30 06:32:36
> UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
>
> And we upgrade/downgrade BIOS version from 1005/1201/1404/1405, and we
> found out that :
> * OLD BIOS version 1005/1201 does not reset the rtc time and keep the
> setup rtc time after reboot.
> * NEW BIOS version 1404/1405 DO reset the rtc time to 2019/01/01 after
> reboot.
>
> Detailed pictures of the BIOS time after reboot is shown in [2],
>
> We suspect the BIOS 1201->1404 upgrade might cause this issue.
>  From x570 BIOS changelog, we found that the big difference between
> 1201/1404 is the AMD AM4 PI upgrade from AGESA 1.0.0.3ABBA to AM4 combo
> PI 1.0.0.4 patch B,

The changelog for my BIOS are the same [1]. Unfortunately, I will not
able downgrade to BIOS of 0404 ver for checking assumption because
changelog description of ver 1404 contains warning "* You will not be
able to downgrade your BIOS after updating to this BIOS version"

> If possible, please tell us about the BIOS version and your hardware
> platform, which can be get from BIOS UI or using "dmidecode"
> in Linux env.

The version of my BIOS is the latest. It is 1405 for my motherboard.
Here is "dmidecode" paste: https://pastebin.com/akBPAvZJ

[1] https://www.asus.com/Motherboards/ROG-Strix-X570-I-Gaming/HelpDesk_BIOS/

--
Best Regards,
Mike Gavrilov.