TX2 modify the display time

yes, it is true

Is this issue reproducible on devkit?

I tested it with the Nano DevKit and the results were the same

Is there a solution?

Does the board still have power supply provided after your so-called reboot/power off?

After the software is shut down, disconnect the power supply and then power it on again.


Then I don’t think it is a bug… it is normal that system time would be gone… if no power supply and also no RTC.

Yes, I know ,we just want to change the system’s default time and not use RTC to save the clock.
According to the default time shown by Date, I think you added the default time when you released the system.
I would like to know how to modify the system time so that it will be displayed after being powered on.

Can RTC initial time 2000-01-01 be changed?

Still checking with internal team about this.

Thank you very much. If you hear of something, let me know.


The time logic here is

  1. It will check the timestamp of file /var/lib/systemd/timesync/clock
  2. If that’s earlier then the systemd compile time, it will use systemd compile time. Otherwise clock file timestamp will be used.

Thus, please put the timestamp you want to see in /var/lib/systemd/timesync/clock.

Thank you very much, I tried, but it didn’t work
The steps are as follows:
sudo -s
touch -t 202208191640 /var/lib/systemd/timesync/clock
stat /var/lib/systemd/timesync/clock
The access time and change time are both 2022-08-19 16:40:00.000000000 +0800
poweroff. disconnect the power supply and then power it on again.
It still shows 2021.7.22
Is there a problem with my procedure?


That is the normal behavior of systemd-timesyncd.
We’ve confirmed this is directly from ubuntu upstream rootfs. Thus, there is nothing we can help here.

You can write a service in each reboot to write a hardcoded value you want.

I’m a little confused.
What “hardware value” do you mean?
Also, what are Ubuntu upstream rootfs?

你現在在用的Ubuntu是從upstream ubuntu18.04/20.04抓下來的. 裡面有很多tool/lib不是 nvidia建出來的.而是ubuntu那邊直接提供的.

你現在這個系統時間是由一個叫systemd-timesyncd的service 負責的. 之所以為何會一直跑到一個"hardcoded-value"(寫死的時間), 也是因為這個service提供的規定. 由於這個service不是我們提供的, 對於它的行為我們無法幫助.

NVIDIA didn’t build the whole" ubuntu" by ourself. There must be some tools that are directly from the Ubuntu 20.04/18.04 directly. That is what we call “Ubuntu upstream”.

There is a “systemd-timesyncd” which handles how the time would be decided. The reason why you always see that value is due the the rule from that service.

I see.
For writing a service, do you have relevant links?
If so, please send it to me. Thank you very much for your support.

其實沒有特別的… 因為看來你只是要設定一個你想要的固定時間, 所以你可以就每次開機起來就用timedatectl去設定一次時間之類的…

那每次開機起來要怎樣跑script基本上就有很多方法… 你可以搜尋ubutnu常用的那幾種… rc.local/systemd之類的

Actually there is nothing special, it seems you just want to set a fixed time, so actually you can just run a script to use timedatectl to set time everytime.

As for how to run a script in each reboot, there are lots of ways in ubuntu and you can search it online… e.g. rc.local or systemd.

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I see. Thank you very much.

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