I'm currently have the exact same issue with my AN515-42-R5GT Acer Nitro 5 Ryzen 2500U + RX560X.
Adding: ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2 iommu=pt
Seemed to help me out on 4.19rc2, but 4.18.10 requires noapic on Sabayon Linux.
Tell me whatever you need an I'll pull it all.
I'm currently have the exact same issue with my AN515-42-R5GT Acer Nitro 5 Ryzen 2500U + RX560X.
Adding: 4]=00:14. 0 ivrs_ioapic[ 5]=00:00. 2 iommu=pt
ivrs_ioapic[
Seemed to help me out on 4.19rc2, but 4.18.10 requires noapic on Sabayon Linux.
Tell me whatever you need an I'll pull it all.