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Paulo Coghi
Asked: 2019-07-25 11:47:54 +0800 CST

18.04 - Unable to boot with Athlon 200GE and Ryzen APU after upgrading from 5.1.* to 5.2.* kernel

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To be able to use my Athlon 200GE APU on Ubuntu 18.04, I have to temporarily boot with nomodeset and update the kernel to, at least, 4.19 from https://kernel.ubuntu.com/~kernel-ppa/mainline/ ( instructions here ).

Since then, I update the kernel with every non-rc mainline kernel release, and the experience is perfect.

Every kernel between 4.19.* and 5.1.* branches works flawlessly, but now, no kernel from branch 5.2.* works (including 5.2, 5.2.1 and 5.2.2).

I am only able to boot with 5.2.* using nomodeset again, but it seems that the APU isn't used on all its potential, since login screen only appears on one monitor (there are two) and with wrong resolution.

What changes were made on branch 5.2 that create this issue? And which options do we have as an user?

kernel 18.04 amd-ryzen

1 Answers

  1. Best Answer

    It seems that graphics off functionality is not working properly (see phoronix forum). Usage of kernel parameter amdgpu.ppfeaturemask=0xffff3fff fixed the issue for me.

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