I have also had this problem - MSI Tomahawk Arctic B350, ryzen 1700, vega 56 gpu
ubuntu 19.04 - ignores bios setting, attempts to boot, kernel panic with lots of AMD-Vi: Completion-Wait loop timed out
Reboot to find grub in rescue mode, and all ext4 partitions wiped. Can't boot live disc either, unless swap to an nvidia graphics card
Only work around is to add the kernel parameters, but booting ubuntu shouldn't wipe my OS?
I have also had this problem - MSI Tomahawk Arctic B350, ryzen 1700, vega 56 gpu
ubuntu 19.04 - ignores bios setting, attempts to boot, kernel panic with lots of AMD-Vi: Completion-Wait loop timed out
Reboot to find grub in rescue mode, and all ext4 partitions wiped. Can't boot live disc either, unless swap to an nvidia graphics card
Only work around is to add the kernel parameters, but booting ubuntu shouldn't wipe my OS?