Hi Richard: This issue should be related to the buggy BIOS ivrs table. Kernel panic when found no southbridge device ID.
Could you try boot kernel with "amd_iommu_dump=1 amd_iommu=off" (remove other kernel parameters you tried to solve this issue). If it works, please attach the dmesg here. I will try to make a kernel patch to make kernel boot with irq map disabled instead of panic. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1776563 Title: Acer Aspire A315 ACPI failure on Ubuntu 18.04, kernel hangs, can't load, kernel freeze (AMD Ryzen 5/Radeon/Raven) To manage notifications about this bug go to: https://bugs.launchpad.net/amd/+bug/1776563/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
