Are these (other than noapic) workarounds really enable APIC controller? With 
acpi=noirq only PIC and MSI entries present in /proc/interrupts. So I assume 
acpi=off does the same. While noapic obviously disables APIC but works fine for 
me.
Looks like ivrs_ioapic... enables APIC, but in my case system is very slow and 
even not always boots.
Is disabled APIC have significant drawbacks (while most of devices placed on 
MSI-routed PCI lanes)?

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https://bugs.launchpad.net/bugs/1776563

Title:
  Acer Aspire A315 IOAPIC failure on Ubuntu 18.04, kernel hangs, can't
  load, kernel freeze  (AMD Ryzen 5/Radeon/Raven) / AMDGPU Hybrid crash

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