I have a Ryzen 1800X + Gigabyte GA-AX370-Gaming K7.
I was suffering from these hangs until I changed a few settings in my BIOS. The
change that made the difference was the Power Supply Iddle Control that was
added in the latest BIOS update. All other settings are left by default:
M.I.T->
Advanced Frequency Settings ->
Core Settings ->
*Power Supply Iddle Control = Typical
*SVM Mode = On
Peripherals ->
*Above 4G Decoding = On
Chipset ->
IOMMU = Auto (Disabled)
BIOS version: F23f AGESA 1.0.0.2a + SMU FW 43.18
I'm running Ubuntu x64 on stock kernel 4.15.0-23-generic with the following
options
GRUB_CMDLINE_LINUX_DEFAULT="radeon.cik_support=1 amdgpu.cik_support=0
iommu=soft"
As an extra measure I completely blacklisted AMDGPU from my system
because it was also a source of many of the kernel freezes (AMD 390x
GPU), and I haven't seen a system freeze in almost two months. (they
were _very_ frequent before, almost daily)
Good luck.
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https://bugs.launchpad.net/bugs/1690085
Title:
Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks
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