Yes, can I send you my email in PM in some way from here?

BTW, I've made a fresh install of 18.04 with irvs params.

dmesg looks really different with the kernel : (uploaded on jsfiddle as
you can see the RED lines quickly)

with default 4.15 kernel : https://jsfiddle.net/qg34bury/
with last 4.18.0 kernel : https://jsfiddle.net/pkchrt6n/

I didnt installed amdgpu pro... Don't know how and I guess it's not
really necessary as all is working good. (dont need nomodeset or
anything and no crash)

and there is my TEMPS after 30 mins at low usage :
https://prnt.sc/khu5dy

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-firmware in Ubuntu.
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:
  New
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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