My Gigabyte AB350m G3 decided to play dead today. In the morning it started OK, 
and after a few light browsing and a little coding I shut it down. After about 
an hour, when I tried powering it on, it was dead. No fan spin, no LED-s, no 
sign of life whatsoever. After troubleshooting all day swapping parts, power 
supplies, removing RAM, re-seating the CPU, I was about ready to start a 
warranty claim. I still could not believe a month and a half old motherboard 
could just die without any prior symptoms. It wasn't even overclocked, even the 
ram was running at only 2133mhz - ultra durable my a**. As a last resort I 
tried removing the BIOS battery and shorting the clr_cmos jumper with the 
battery removed and it came back to life.
After all the problems I had with Ubuntu support, when things started to look 
like they were improving, this made me think seriously about ordering an Asus 
or even AsRock replacement board for when it decides to have some other 
annoying problem. I would not recommend this board in the current state, 
especially not for an Ubuntu Linux system.
Sorry for not being exactly on topic since this is probably not Linux or Ubuntu 
related. Unless Ubuntu  does something strange on shutdown?

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

Title:
  System doesn't boot properly on Gigabyte AM4 motherboards (AMD Ryzen)

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Confirmed

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.
  --- 
  ApportVersion: 2.20.4-0ubuntu2
  Architecture: amd64
  DistroRelease: Ubuntu 17.04
  InstallationDate: Installed on 2015-08-06 (581 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150728.1)
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Tags:  zesty
  Uname: Linux 4.11.0-rc1-custom x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: Upgraded to zesty on 2017-03-03 (6 days ago)
  UserGroups:
   
  _MarkForUpload: True

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