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[Peter Saunderson <peteasa@xxxxxxxxx>]

See first patch (does not fix the problem) and further discussion at
http://marc.info/?l=linux-kernel&m=146435528326660&w=2

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https://bugs.launchpad.net/bugs/1514052

Title:
  erratic fan speed and little control kernel 4.2

Status in linux package in Ubuntu:
  Triaged

Bug description:
  After upgrading to Ubuntu 15.10 my CPU fan started speeding and
  slowing without good reason even when the PC is idle.

  This has been bisected to commit f989e55452c74b4f7b22c889b8ec9f1192aaeec4 :
  i8k: Add support for fan labels

  This patch adds labels support for fans if SMM function with EAX register
  0x03a3 reports it. This information was taken from DOS binary NBSVC.MDM.

  Additionally this patch change detection of fan presece. Instead reading fan
  status now detection is based on new label SMM function. Dell DOS binary
  NBSVC.MDM is doing similar checks, so we should do that too.

  This patch also remove I8K_FAN_LEFT and I8K_FAN_RIGHT usage from hwmon driver
  part because that names does not make sense anymore. So numeric constants are
  used instead. Original /proc/i8k ioctl part was not changed for compatibility
  reasons.

  Signed-off-by: Pali Rohár <pali.rohar@xxxxxxxxx>
  Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
  Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

  WORKAROUND: Shutdown. After it cools down for a while, turn it on.

  Tried intel_pstate but it is not supported for some reason on my
  machine ie the following does not work and I am left with driver:
  acpi-cpufreq

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"

  Could not see ACPI Thermal Zones reported in dmesg
  $ dmesg | grep ACPI
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1514052/+attachment/4527212/+files/dmesg

  ---
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  pas        2076 F.... pulseaudio
   /dev/snd/controlC1:  pas        2076 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=68ce068c-1889-4f00-9b8a-12d7dc64348b
  InstallationDate: Installed on 2011-02-22 (1718 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  MachineType: Dell Inc. Inspiron 580
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-17-generic root=UUID=bf510382-4d2b-49d6-b9d9-ac6e3f6334eb ro intel_pstate=enable
  ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-17-generic N/A
   linux-backports-modules-4.2.0-17-generic  N/A
   linux-firmware                            1.149.1
  RfKill:

  Tags:  wily
  Uname: Linux 4.2.0-17-generic x86_64
  UpgradeStatus: Upgraded to wily on 2015-11-06 (0 days ago)
  UserGroups: adm admin cdrom dialout fuse lpadmin plugdev sambashare vboxusers wireshark
  _MarkForUpload: True
  dmi.bios.date: 11/13/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0C2KJT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd11/13/2010:svnDellInc.:pnInspiron580:pvr:rvnDellInc.:rn0C2KJT:rvrA00:cvnDellInc.:ct3:cvr:
  dmi.product.name: Inspiron 580
  dmi.sys.vendor: Dell Inc.

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