"The fact that ACPI was designed by a group of monkeys high on LSD, and is some 
of the worst designs in the industry obviously makes running it at any point 
pretty damn ugly."
Torvalds, Linus (2005-07-31). Message. linux-kernel mailing list. IU. Retrieved 
on 2006-08-28.

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

Title:
  Ubuntu 18.04 can't load kernel on Acer Aspire A315 (Ryzen5/Radeon/FHD)

Status in amd:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  Confirmed

Bug description:
  CPU: Ryzen 5 2500U
  VGA: Radeon 535
  Notebook: Acer Aspire A315
  I've just bought a new AMD Ryzen/Radeon notebook (Acer Aspire 3) and I wanted 
to install an Ubuntu/Kubuntu 18.04 on it. I checked the bios settings and uefi 
was the only boot option, so there is no legacy mode what I had used with my 
old computer before. I downloaded the normal iso image and made an usb boot 
pendrive using mkusb. The boot was okay, I got an uefi type menu but after 
starting the kernel it paniced(?) instantly. 
  Error messages: ACPI Error [MAC0] Namespace lookup failure 
  ACPI ERROR 1 table load failures, 13 successful 
  BUG: soft lockup CPU#0 stuck for 22s
  ...
  ...
  EFI VGA framebuffer device
  clocksource tsc mask
  Switching to colour framebuffer device
  [28.040001] ...
  ...
  ...

  I've tried to boot the same pendrive on my girlfriend's Acer
  Travelmate with uefi and worked well.

  I searched and I found that the problem is maybe in connection with
  uefi framebuffer but I am not sure.

  Ubuntu 16.04 can be loaded with nomodeset and noacpi parameters but
  for 18.04 none of them are working. I tried 4.16,4.17 kernels too
  (replaced on live usb) but without any success. The result is totally
  equivalent.

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