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[Vojtěch Látal <1327581@xxxxxxxxxxxxxxxxxx>]

I have updated BIOS, unfortunately it changed nothing neither on 3.15rc8
nor on 3.13.0-29-generic.

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
A14
12/26/2013

I'm not sure if I get you right - do you want me to fill another bug
report because of BIOS update?

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https://bugs.launchpad.net/bugs/1327581

Title:
  Dell Latitude E5520

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After the upgrade from 13.10 to 14.04 fan on my Dell Latitude E5520 is working weird. It works in cycles as follows:
  100% for about 0.1s
  0% 0.1s
  cca 60% for 2 - x seconds, depending on cpu temperature I think.

  Before the upgrade fan speed has been set depending on cpu temperature
  SMOOTHLY with some hysteresis.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-29-generic 3.13.0-29.53
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  latal      3590 F.... pulseaudio
   /dev/snd/pcmC0D0p:   latal      3590 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Sat Jun  7 17:54:29 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2012-07-10 (696 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: Dell Inc. Latitude E5520
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic root=UUID=83b4c35b-1649-4b2c-9d62-5c56bdcaa949 ro quiet splash intel_pstate=enable vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-29-generic N/A
   linux-backports-modules-3.13.0-29-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-05-09 (29 days ago)
  dmi.bios.date: 11/30/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 03PH4G
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd11/30/2011:svnDellInc.:pnLatitudeE5520:pvr01:rvnDellInc.:rn03PH4G:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5520
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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