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Red_Fir

Member

Registered: 2023-10-01

Posts: 20  

[SOLVED] Unintended reboot

My Dell 9020 reboots on every shutdown  unless I explicitly hit the power button after shutdown since install of Devuan 6.
This is a multiboot machine running Artix an Salix, too.
It did not do this with Devuan 5, nor does it do it with the other distro's
I have gone through the bios and ensured every restart, or timed boot is disabled.
I usually shut it down during the week, and leave it running over the weekend to save wear on a hard drive

{sudo halt} will shut it down cleanly

Any ideas on how to address this?

Last edited by Red_Fir (2026-06-04 01:56:15)

kapqa

Member

Registered: 2019-01-02

Posts: 689  

Re: [SOLVED] Unintended reboot

did you try to disable "fast boot"?
did you try to set BIOS do "default settings"?
is it a laptop or deksotp pc? ~ modern latop can have strange behaviours , also "thanks" to "internal" batteries.

EDIT: had a similar issue on a desktop if remember correctly; in my case it was the mouse that was causing "wakeup" calls unintendedly and made the desktop turn-on even if supposedly it wws turned off; changing to another mouse solvedt e issue.

Last edited by kapqa (2026-06-04 09:39:59)

pcalvert

Member

Registered: 2017-05-15

Posts: 320  

Re: [SOLVED] Unintended reboot

What is the output produced by this command?:

apt show intel-microcode

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Altoid

Member

Registered: 2017-05-07

Posts: 2,056  

Re: [SOLVED] Unintended reboot

Hello:

... Dell 9020 reboots on every shutdown unless I explicitly hit the power button after shutdown ...

I have had a similar issue with my Sun U24 WS for years, fortunately it is not at every shutdown but just when the %$#"¿ crap BIOS feels like it.

I have found that it occurs when there are sharp changes in ambient temperature between booting and shutting down, most probably due to a badly written BIOS + a faulty/wrong on-board sensor spec, so it is an issue I decided to ignore.

That said, yours seems to be a well known issue with that Dell rig.
A quick web search with the unsolicited Google IA intervention (?) brought up this*:

If your Dell OptiPlex 9020 is randomly rebooting on Linux, it is usually triggered by a kernel panic upon hardware conflict, failing storage, or power supply issues.

* to be taken with a few grains of salt. 8^°

See here.

If sudo halt works, you may want to write up a script to shut it down via sudo halt && sudo shutdown -now.
Check the respective man files for the proper syntax.

Best,

A.

Last edited by Altoid (2026-06-04 18:52:16)

Red_Fir

Member

Registered: 2023-10-01

Posts: 20  

Re: [SOLVED] Unintended reboot

$ apt show intel-microcode
Package: intel-microcode
Version: 3.20251111.1~deb13u1

pcalvert

Member

Registered: 2017-05-15

Posts: 320  

Re: [SOLVED] Unintended reboot

I'm sorry, I should have asked you this instead:

What is the output produced by this command?:

aptitude show intel-microcode

Note: If aptitude is not installed, please install it first.

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Red_Fir

Member

Registered: 2023-10-01

Posts: 20  

Re: [SOLVED] Unintended reboot

Package: intel-microcode         
Version: 3.20251111.1~deb13u1
State: not installed
Priority: standard

I will give it a whirl