I have "not-G" A315 with 2200u and can boot with acpi=noirq. With lots
of warnings, but works, no slowdown. Thought this option does same with
irqs as acpi=off or pci=noacpi (using MPTable instead of ACPI table).

I'm still on factory 1.03 BIOS, and with "noapic" parameter everything looks OK 
on Ubuntu 18.10. Also have idle=halt param to avoid "random soft lockup bug" 
https://bugzilla.kernel.org/show_bug.cgi?id=196683
I suspect, updating BIOS may bring more problems. So even new AGESA (which may 
fix lockup bug) is no worth reason for me to update.

** Bug watch added: Linux Kernel Bug Tracker #196683
   https://bugzilla.kernel.org/show_bug.cgi?id=196683

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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

Status in amd:
  Fix Released
Status in Linux:
  Incomplete
Status in linux package in Ubuntu:
  Triaged
Status in linux-firmware package in Ubuntu:
  Confirmed

Bug description:
  CPU: Ryzen 5 2500U
  VGA: Radeon 535
  Notebook: Acer Aspire A315

  This is a brand new notebook on the market with Ryzen 5/Radeon. 
  The default kernel of Ubuntu(18.04) hangs at loading with message:

  tsc: Refined TSC clocksource calibration: 1996.250 MHz
  clocksource: tsc: mask: 0xffffffffffffffff max_cycles: (...), max_idle_ns: 
(...) 
  Soft lockup

  Using pci=noacpi kernel parameter kernel loads without any problem but
  my notebook produces more heat than on Win10. If I know right Acer
  notebooks need ACPI to the correct power management.

  The same thing happens on mainline 4.17,4.18rc1-2.
  BIOS upgrade to the latest version: 1.08 hasn't helped

  This problem has been reported upstream:
  https://bugzilla.kernel.org/show_bug.cgi?id=200087

  The latest correctly working kernel was 4.13.* but the heat problem
  was present with this too.

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