I used Zenstates-Linux from Kai-Heng Feng's reference to
https://bugzilla.kernel.org/show_bug.cgi?id=196683 and things have been
much stabler, I don't think I have seen a freeze since then.


I have been updating all the while and rebooting, so hard to tell if
something else got picked up, but I suspect the C6 disable did the
trick.  At some  point, I might try enabling it back again, maybe after
the 18.04 release.

At this point, not sure if you want to keep this bug open, whatever
works for you guys.

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  AMD Ryzen 7 1800X system (Dell Inspiron 5675) randomly freezes

Status in linux package in Ubuntu:

Bug description:
  This is happening every day or so.  I cannot see anything in the
  kern.log or syslog that give me a clue on where/what the issue might.
  I was using Ubuntu 17.10 earlier and upgraded to Ubuntu 18.04 on
  3/3/2018, since I thought kernel 4.15 might have better support for
  the ryzen 7 and also maybe amdgpu for the radeon 580 might be newer.
  I have removed most external devices except for networking and HDMI
  and audio out.

  Attached a tarball of info, although I believe that since I used
  'ubuntu-bug linux' command, the information might be duplicated,
  apologize for any extra attachments.

  $ ls -l dell-5675-sysinfo/
  total 168
  -rw-r--r-- 1 pss pss 83139 Mar  4 19:47 dmesg
  -rw-r--r-- 1 pss pss 26154 Mar  4 19:44 dmidecode
  -rw-r--r-- 1 pss pss  1507 Mar  4 19:45 gpu-manager.log
  -rw-r--r-- 1 pss pss   110 Mar  4 19:44 lsb-release-a
  -rw-r--r-- 1 pss pss  1464 Mar  4 19:44 lscpu
  -rw-r--r-- 1 pss pss  4353 Mar  4 19:46 lspci
  -rw-r--r-- 1 pss pss  4105 Mar  4 20:05 lspci-vvv-radeon-580.txt
  -rw-r--r-- 1 pss pss 19318 Mar  4 19:48 
  -rw-r--r-- 1 pss pss   104 Mar  4 19:44 uname-a
  -rw-r--r-- 1 pss pss    35 Mar  4 20:27 version.log

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-10-generic 4.15.0-10.11
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
   /dev/snd/controlC1:  pss        1801 F.... pulseaudio
   /dev/snd/controlC0:  pss        1801 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Mar  4 20:21:55 2018
  InstallationDate: Installed on 2018-02-16 (16 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  MachineType: Dell Inc. Inspiron 5675
   PATH=(custom, no user)
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-10-generic.efi.signed 
root=UUID=d6a2ae1e-5421-435f-8e4c-e377133cebc9 ro quiet splash vt.handoff=1
   linux-restricted-modules-4.15.0-10-generic N/A
   linux-backports-modules-4.15.0-10-generic  N/A
   linux-firmware                             1.172
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-03-04 (1 days ago)
  dmi.bios.date: 12/04/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.6
  dmi.board.name: 07PR60
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 1.3.6
  dmi.product.family: Inspiron
  dmi.product.name: Inspiron 5675
  dmi.product.version: 1.3.6
  dmi.sys.vendor: Dell Inc.

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