I'm not sure hardcoding them would be so good - I was getting a
performance hit when using the ivrs_ioapic params. Now I'm using these
ones suggested in the other thread and everything works better for me:
https://bugs.launchpad.net/amd/+bug/1776563/comments/445
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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
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: 0x 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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