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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1222112

Title:
  coretemp: Errata AE18 not fixed, update BIOS or microcode of the CPU!

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Symptoms:
  Excessive fan use.
  Ran fine with Ubuntu Natty Narwhal, but successive upgrades resulted in both fans running full shortly after bootup (regression). I justified it thinking that Ubuntu had higher requirements, until infrequent failed attempts to boot finally resulted in the on-screen posting of "coretemp: Errata AE18 not fixed, update BIOS or microcode of the CPU!" on Raring.

  Now on Saucy, although without any failed boots, I find the same
  error by checking dmesg:

   dmesg | grep coretemp
  [   47.314949] coretemp: Errata AE18 not fixed, update BIOS or microcode of the CPU!
  [   47.314958] coretemp: Errata AE18 not fixed, update BIOS or microcode of the CPU!

  
  sudo lsmod | grep coretemp outputs coretemp               13195  0

  sudo sensors -s gives no output at the moment.

  I do have the coretemp listed to be loaded:

  cat /etc/modules
  # /etc/modules: kernel modules to load at boot time.
  #
  # This file contains the names of kernel modules that should be loaded
  # at boot time, one per line. Lines beginning with "#" are ignored.

  lp
  #speedstep_centrino # kernel's job now, cpu frequency scaling
  #acpi_cpufreq   # kernel's job now, cpu frequency scaling
  cpufreq_ondemand #responsive, cpu frequency scaling
  #cpufreq_conservative # slow, cpu frequency scaling

  ## Chip drivers , as per lm-sensors, sudo sensors-detect, and Psensor
  #coretemp
  lm63

  ## Used by macfanctld from https://launchpad.net/~mactel-support/+archive/ppa
  applesmc
  coretemp

  
  Comments & observations
  I do know Errata is code for defective firmware and that this has been dealt with prior http://lkml.org/lkml/2007/6/16/173 (thus this is a regression) and that I'm not alone:
  https://bbs.archlinux.org/viewtopic.php?id=143492
  http://ww.ubuntuforums.org/showthread.php?t=814314

  Interestingly, http://ubuntuforums.org/showthread.php?t=1239544
  mentions in passing " Intel's microcode update", which I find isn't
  applicable considering that my fans ran fine on Natty. I find the
  other suggestion, "put the following into /etc/rc.local" disconcerting
  considering that software is supposed to accommodate defective
  microcode and regularly does, but also that half a decade has come and
  gone with this issue.

  Still, it seems most plausible that the pertinent microcode is not loaded before the coretemp module jumps into action.
  --- 
  ApportVersion: 2.12.1-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  mo         3726 F.... pulseaudio
   /dev/snd/controlC0:  mo         3554 F.... volumeicon
                        mo         3726 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=971dcaf3-f640-4d1c-9cb6-ea8eba0cab54
  InstallationDate: Installed on 2011-09-05 (733 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  MachineType: Apple Computer, Inc. MacBookPro1,1
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-4-generic root=UUID=9c44e3b1-d6d1-4ca7-a621-c0142ded125a ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-4-generic N/A
   linux-backports-modules-3.11.0-4-generic  N/A
   linux-firmware                            1.113
  StagingDrivers: zram
  Tags:  saucy staging
  Uname: Linux 3.11.0-4-generic i686
  UpgradeStatus: Upgraded to saucy on 2013-09-01 (6 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 10/12/06
  dmi.bios.vendor: Apple Computer, Inc.
  dmi.bios.version: MBP11.88Z.0055.B08.0610121325
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F425BEC8
  dmi.board.vendor: Apple Computer, Inc.
  dmi.board.version: PVT
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 8
  dmi.chassis.vendor: Apple Computer, Inc.
  dmi.chassis.version: Mac-F425BEC8
  dmi.modalias: dmi:bvnAppleComputer,Inc.:bvrMBP11.88Z.0055.B08.0610121325:bd10/12/06:svnAppleComputer,Inc.:pnMacBookPro1,1:pvr1.0:rvnAppleComputer,Inc.:rnMac-F425BEC8:rvrPVT:cvnAppleComputer,Inc.:ct8:cvrMac-F425BEC8:
  dmi.product.name: MacBookPro1,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Computer, Inc.

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