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[Bug 1514052] Re: erratic fan speed and little control kernel 4.2


Loaded the latest Kernel .. 
Following produced erratic fan speed .. see that the fan naming seems sorted.  Pity that did not solve it!
# echo 200 > /sys/class/hwmon/hwmon3/pwm1
# echo 70 > /sys/class/hwmon/hwmon3/pwm1
# sensors
Adapter: PCI adapter
temp1:        +57.0°C  (crit = +120.0°C, hyst = +90.0°C)

Adapter: ISA adapter
Core 0:       +32.0°C  (high = +83.0°C, crit = +99.0°C)
Core 1:       +30.0°C  (high = +83.0°C, crit = +99.0°C)
Core 2:       +32.0°C  (high = +83.0°C, crit = +99.0°C)
Core 3:       +29.0°C  (high = +83.0°C, crit = +99.0°C)

Adapter: ISA adapter
in0:          +0.85 V  (min =  +2.65 V, max =  +2.28 V)  ALARM
in1:          +3.02 V  (min =  +2.87 V, max =  +0.66 V)  ALARM
in2:          +2.00 V  (min =  +1.01 V, max =  +1.44 V)  ALARM
+3.3V:        +3.29 V  (min =  +4.56 V, max =  +4.37 V)  ALARM
in4:          +2.99 V  (min =  +2.66 V, max =  +2.82 V)  ALARM
in5:          +2.22 V  (min =  +2.62 V, max =  +3.06 V)  ALARM
in6:          +2.22 V  (min =  +2.29 V, max =  +2.83 V)  ALARM
3VSB:         +3.34 V  (min =  +5.35 V, max =  +4.58 V)  ALARM
Vbat:         +3.02 V  
fan1:        3199 RPM  (min =   13 RPM)
fan2:         809 RPM  (min =   21 RPM)
temp1:        -78.0°C  (low  = +39.0°C, high = -68.0°C)  sensor = thermal diode
temp2:         -8.0°C  (low  = -25.0°C, high = -93.0°C)  sensor = thermistor
temp3:        -67.0°C  (low  = -77.0°C, high = -49.0°C)  sensor = Intel PECI
intrusion0:  ALARM

Adapter: Virtual device
Processor Fan:   3222 RPM
Motherboard Fan:  815 RPM

# uname -a
Linux HomeMegaUbuntu 4.4.0-040400rc3-generic #201511300321 SMP Mon Nov 30 03:23:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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  erratic fan speed and little control kernel 4.2

Status in linux package in Ubuntu:

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

  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:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"

  Could not see ACPI Thermal Zones reported in dmesg
  $ dmesg | grep ACPI

  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
   /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)
   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
   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

  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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