[Bug 1776563] Re: Acer Aspire A315 IOAPIC failure on Ubuntu 18.04, kernel hangs, can't load, kernel freeze (AMD Ryzen 5/Radeon/Raven) / AMDGPU Hybrid crash

Hi, same problem on my Laptop, also ACER315.41 but with Ryzen 7 2700U, Ubuntu 18.10, kernel: linux-4.18.0-13
The option pci=noacpi seems unstable, I'm not always able to complete the boot procedure and the graphical interface is not started (Unity or whatever).

As Ovidiu suggests in comment #314 this combination seems to work at best, but slows down the boot of a few seconds:
splash (erase quiet)
ivrs_ioapic[4]=00:14.0
ivrs_ioapic[5]=00:00.2
clocksource=hpet
iommu=on
amd_iommu=on
amdgpu.dc=1

CPU temp below 50°C even for a high load, battery duration seems ok, but
I have not measured it. BIOS version 1.09

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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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