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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1743156

Title:
  [regression] 4.4.0-110 doesn't load AMD microcode

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  When booting my AMD system with 4.4.0-109.132, the microcode is
  updated:

  root@ocelot:~# journalctl -k | grep microcode
  Jan 13 15:26:36 ocelot kernel: microcode: CPU0: patch_level=0x0500010d
  Jan 13 15:26:36 ocelot kernel: microcode: CPU1: patch_level=0x0500010d
  Jan 13 15:26:36 ocelot kernel: microcode: Microcode Update Driver: v2.01 <tigran@xxxxxxxxxxxxxxxxxxxx>, Peter Oruba
  Jan 13 15:26:36 ocelot kernel: microcode: CPU0: new patch_level=0x05000119
  Jan 13 15:26:36 ocelot kernel: microcode: CPU1: new patch_level=0x05000119

  However, with 4.4.0-110.133, no microcode is loaded:

  root@ocelot:~# journalctl -k | grep microcode
  # nothing

  Extra information on the system:

  root@ocelot:~# sed -n '1,/^$/ p' /proc/cpuinfo 
  processor	: 0
  vendor_id	: AuthenticAMD
  cpu family	: 20
  model		: 2
  model name	: AMD C-60 APU with Radeon(tm) HD Graphics
  stepping	: 0
  microcode	: 0x5000119
  cpu MHz		: 800.000
  cache size	: 512 KB
  physical id	: 0
  siblings	: 2
  core id		: 0
  cpu cores	: 2
  apicid		: 0
  initial apicid	: 0
  fpu		: yes
  fpu_exception	: yes
  cpuid level	: 6
  wp		: yes
  flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni monitor ssse3 cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch ibs skinit wdt cpb hw_pstate kaiser vmmcall arat npt lbrv svm_lock nrip_save pausefilter
  bugs		: fxsave_leak sysret_ss_attrs
  bogomips	: 1999.97
  TLB size	: 1024 4K pages
  clflush size	: 64
  cache_alignment	: 64
  address sizes	: 36 bits physical, 48 bits virtual
  power management: ts ttp tm stc 100mhzsteps hwpstate cpb

  root@ocelot:~# lsb_release -rd
  Description:	Ubuntu 16.04.3 LTS
  Release:	16.04

  root@ocelot:~# apt-cache policy amd64-microcode
  amd64-microcode:
    Installed: 2.20160316.1
    Candidate: 2.20160316.1
    Version table:
   *** 2.20160316.1 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-110-generic 4.4.0-110.133
  ProcVersionSignature: Ubuntu 4.4.0-109.132-generic 4.4.98
  Uname: Linux 4.4.0-109-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jan 13 15:26 seq
   crw-rw---- 1 root audio 116, 33 Jan 13 15:26 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Date: Sat Jan 13 15:30:51 2018
  HibernationDevice: RESUME=UUID=cfe87834-be9d-4a32-93d1-3f2b655e58af
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: System manufacturer System Product Name
  PciMultimedia:
   
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-109-generic root=UUID=9696399d-3bed-4126-b203-7672f2ea0576 ro hugepages=3072 kaslr nmi_watchdog=0 possible_cpus=2 pti=on transparent_hugepage=never vsyscall=none
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-109-generic N/A
   linux-backports-modules-4.4.0-109-generic  N/A
   linux-firmware                             1.157.14
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/22/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0502
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: C60M1-I
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0502:bd05/22/2014:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnC60M1-I:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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