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When my computer is not plugged in the poweroff function doesn't work. It just boots up after poweroff. Whenever I poweroff by the way of GUI clicking or typing command poweroff or halt, my computer just reboots.

  • But if plugged in, my notebook works without any problem. Can any help me ?
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That is a hardware bug: your system does not recognize the software telling the system to stop, it then returns a non supported error/action and the operating system will just reboot.

Possible fix: set ACPI to not route IRQs.

 gksudo gedit /etc/default/grub

Find and edit the option that is:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=noirq"

and update grub ...

sudo update-grub

Now do a reboot and then a shutdown and see if this fixes it.

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