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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1671360

Title:
  System doesn't boot properly on AMD Ryzen / Gigabyte GA-AB350-gaming-3

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I'm trying to run ubuntu on Ryzen 1700x with Gigabyte GA-AB350-gaming-3 
motherboard,
  and it has a load of problems, starting with not being able to boot normally.

  During normal boot, on 16.10 as well as 17.04 beta:
  system doesn't boot normally, hangs with a lot of "unexpected irq trap at 
vector 07"
  messages displayed.

  
  Following advice from various places, I've tried:disable cpu freq governor 
and cpu handling in acpi settings

  1. add "acpi=off" to boot params

  That helps, allowing me to boot into recovery mode, though it leaves
  me with system seeing only one core, is really slow and still only
  boots in recovery mode.

  2. Compile own kernel using 4.11.rc1 and disabling cpu freq governor
  and cpu handling in acpi settings. Boot with "quiet loglevel=3"
  option.

  That gets me even further - system sees all cores now. Still only recovery 
mode though,
  but its enough to get info for this bug report.

  Some observed problems:

  1. dmesg reports *a lot* of messages like this all the time:

  [  163.362068] ->handle_irq():  ffffffff87a7e090, 
  [  163.362081] bad_chained_irq+0x0/0x40
  [  163.362089] ->handle_irq():  ffffffff87a7e090, 
  [  163.362090] amd_gpio_irq_handler+0x0/0x200
  [  163.362090] ->irq_data.chip(): ffffffff88587e20, 
  [  163.362090] ioapic_ir_chip+0x0/0x120
  [  163.362090] ->action(): ffffffff884601c0
  [  163.362091]    IRQ_NOPROBE set
  [  163.362099] ->handle_irq():  ffffffff87a7e090, 
  [  163.362099] amd_gpio_irq_handler+0x0/0x200
  [  163.362100] ->irq_data.chip(): ffffffff88587e20, 
  [  163.362100] ioapic_ir_chip+0x0/0x120
  [  163.362101] ->action(): ffffffff884601c0

  I've tried to redirect dmesg to a file, stopped after a short while,
  it generated 400M of those.

  2. Systemd cannot start journald. Perhaps because it cannot cope with
  amount of kernel logs?

  3. Looking at pci, I've noticed something called AMDI0040
  (/sys/bus/acpi/devices/AMDI0040, path=_SB_.EMMC), among AMDI0010,
  AMDI0020, AMDI0030. Those however are mentioned in kernel source,
  kernel and google are completely silent about AMDI0040.

  
  Phoronix tested ryzen using different motherboard, and it worked better 
(though not well),
  so I suspect it is an issue with motherboard.

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