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| 1. Edit `/etc/default/grub` with admin rights | |
| 2. Find line: GRUB_CMDLINE_LINUX_DEFAULT=" " | |
| 3. Add in quotes: GRUB_CMDLINE_LINUX_DEFAULT="processor.max_cstate=1 idle=poll" | |
| 4. Save the file | |
| 5. Rebuild grub boot menu: grub-mkconfig -o /boot/grub/grub.cfg | |
| 5a.Some distributions require: grub2-mkconfig -o /boot/grub2/grub.cfg | |
| 6. Reboot system | |
| Notes: If you are using Fedora without UEFI and cannot regenerate your grub menu, | |
| open: /etc/default/grub and | |
| edit the line: | |
| GRUB_ENABLE_BLSCFG=true | |
| and change it to: | |
| GRUB_ENABLE_BLSCFG=false | |
| Save the file then run the grub2-mkconfig again as explained in list items 5 and 5a, | |
| then reboot the system. |
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I am hoping this file shows up in search engine results to make fixing these issues much faster and easier for people than it was for me. It took me a year to find a workaround for my bugged Ryzen Zen1 board back in late 2017. I finally narrowed it down to c-states and found the correct kernel line options a year later in late 2018. During that year I could not use Linux on that Ryzen machine since it would randomly reboot after being idle long enough.