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Shutdown & Reboot freeze

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I have a PC with motherboard Asus Prime H510M-K with on board GPU. Ubuntu version: 20.04.03 LTS The best configuration that I got of grub file was

quiet splash nomodeset acpi=force apm=power_off

Today, when I try to reboot or shutdown the machine, the OS just freezes.

Remarks:

  1. the nomodeset was necessary to avoid login issue freezing (after you log in the screen freezes at purple screen)
  2. If I set acpi=none, the OS starts with just 1 CPU core available

I try to figure out if the cause is related with GPU and/or APM. Any help is welcomed. Best Regards,

Fernando.

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