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I had been fighting with boot stability for my Ryzen 2400G desktop, initially because of buggy BIOS from ASRock, but then afterwards because of what I consider a subtle issue. After installing 18.04 and 18.10 with the same results, the system would rarely boot reliably (but would on occasion), I figured out that I needed to add a boot flag,

iommu=soft

to /etc/default/grub. This webpage from Majaro clued me in,

https://forum.manjaro.org/t/amd-ryzen-problems-and-fixes/55533

I have not found any information like this on Ask Ubuntu, but maybe I'm wrong. Considering there are TONS of posts regarding Ryzen (in)stability issues, and none of them seem especially relevant anymore (newer kernels are available), what should I do with this information? Is this a bug? Is there an Ubuntu webpage for Ryzen APU issues? Could this have been an issue with the motherboard+CPU combination and not Ubuntu?

  • First, and most importantly, complain to the manufacturer and complain to the shop that sold it to you. You paid them (a lot of) your hard-earned money, and received lousy-or-defective hardware in exchange. If folks keep buying their (defective) systems, then why should they bother to fix the problem? Convince the shop to stop stocking broken systems, and then perhaps the manufacturer will fix their product. Second, and least important, file a bug report against the 'linux' package using these instructions (warning: it's NOT fast or easy!) – user535733 Nov 27 '18 at 2:44

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