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[Chascon <1222112@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apple macbook pro

** Attachment added: "version.log"
   https://bugs.launchpad.net/bugs/1222112/+attachment/3807318/+files/version.log

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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:
  New

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.

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