I noticed recently that shutting down my Linux (Ubuntu 20.04) desktop does not power it down once everything has come to a halt. It states Power down but the led is still glowing and the fan is still moving etc. which it shouldn't!

The result is a terminal stating as showin in the picture:

last lines of the shutdown process

I assumed something might be configured wrong in the BIOS but when I tried with Windows (I'm sorry!) it worked as usual so the problem seems to come from the linux side.

Of course I searched and tried other solutions like: Shutdown does not power off. Why?

However neither the KDE shutdown option nor the terminal call seem to work.

Another thing I tried was




but the answer seems outdated and does not work (anymore?). So even with the option

GRUB_CMDLINE_LINUX_DEFAULT="noplymouth intel_iommu=on acpi=force apm=power_off"

nothing happens (tried acpi=force and apm=power_off separately, too) and the computer still stays powered-on after shutting down.

One hint might be the output of acpi -V -i

No support for device type: power_supply

So is this the problem? Is there a way of configuring acpi correctly? Or did I miss something else?


  • File a bug report: bugzilla.kernel.org/enter_bug.cgi – Artem S. Tashkinov Dec 6 '20 at 11:14
  • Well first of all the question is: is this a bug or am I doing something wrong? – Tobias Reich Dec 6 '20 at 13:57
  • This surely looks like a bug only I can't say if it's a bug with your HW (e.g. BIOS) or kernel. Most likely it's down to your BIOS but there's a chance it's caused by the kernel. – Artem S. Tashkinov Dec 6 '20 at 15:09
  • But if it's the BIOS (UEFI) why does it work with Windows then? Aside from that it worked a while ago. I don't know if this came with the update to Ubunto 20.04 or so but it suddenly appeared. – Tobias Reich Dec 6 '20 at 15:27
  • Linux and Windows work with ACPI differently in subtle but critical ways. – Artem S. Tashkinov Dec 6 '20 at 15:31

I had the same problem as you had here with the same errors showing on the screen when I shut down or restarted the computer. I also tried all your solutions listed here. I use the internal GPU coming with the processor intel i7.

Then I find out that my computer shuts down properly only on Ubuntu 18 with the kernel version or (I can't remember properly). After updating the kernel version to any higher one will cause the same shutdown problem. Ubuntu 20 comping with 5.8. generic, so my computer never shuts down properly. I've tried to install an older kernel version, but I failed lots of times. Maybe you can solve the problem by installing an older version kernel successfully. I guess there is an inconsistency problem between Ubuntu and the hardware.

Finally, I gave up trying to solve this problem in Ubuntu 20 and switched to Fedora 33. My computer works perfectly on Fedora, although it has the kernel version of 5.11.


I solved it by installing NVIDIA Proprietary Driver following https://wiki.debian.org/NvidiaGraphicsDrivers, kernel and legacy driver from backports. That resolved the poweroff issue. The reboot freeze was solved by GRUB_CMDLINE_LINUX="reboot=pci".

On laptop Asus K70IO (2009, NVIDIA GeForce GT 120M) freshly installed with Debian 10 Buster.

  • Thanks for the suggestion but I use my NVidia graphics board only for the VMs and the Intel GPU for Linux. So I'm not sure that's really the case here. – Tobias Reich Dec 14 '20 at 13:50

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