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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1747463
Title:
kernel crashes unless IOMMU is disabled on Ryzen 1800X
Status in linux package in Ubuntu:
Incomplete
Bug description:
I'm on a Ryzen 1800X and Biostar B350GT5 on bionic kubuntu.
Lots of AMD-Vi logged events and I get irq crashes or acpi hangups
with a normal boot. How I it to work is to disable IOMMU in the BIOS
and add "iommu=soft" to the kernel booting options in grub.
linux can then detect everything properly (all cores) and I've had
zero crashes. The only issue is that it's using software IOMMU.
Alternatively it boots with the kernel option "acpi=off" but only
detects a single core/thread.
I attached a kernel log.
I believe(d) this might be related to
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1671360
and https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1690085
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