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[madbiologist <1244630@xxxxxxxxxxxxxxxxxx>]

This might be fixed in the upstream 3.12.5 kernel by this commit (the
model name in the patch description is mispelt, but I've checked the
patch's source code and it is spelt correctly there, which is what
matters):

commit 97b054c2ee8ba8a3542f391641fd78f6e3e44f0a
Author: Alan Cox
Date: Tue Dec 3 13:56:56 2013 -0800

    drivers/char/i8k.c: add Dell XPLS L421X
    
    commit 9aa5b0181bdf335f0b731d8502e128a862884bcd upstream.
    
    Addresses https://bugzilla.kernel.org/show_bug.cgi?id=60772
    
    Signed-off-by: Alan Cox
    Reported-by: Leho Kraav
    Signed-off-by: Andrew Morton
    Signed-off-by: Greg Kroah-Hartman

** Bug watch added: Linux Kernel Bug Tracker #60772
   http://bugzilla.kernel.org/show_bug.cgi?id=60772

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https://bugs.launchpad.net/bugs/1244630

Title:
  Ubuntu 13.10 fan always on

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  System : XPS L421X 
  Bios Version : A12
  After the upgrade to Ubuntu 13.10, but maybe also before,  in my system the fan are always on.
  Why ?
  Thks

  Vincenzo Graziadei

  In dmesg I've found this warning :
  [   18.080298] ACPI Warning: 0x0000000000000428-0x000000000000042f SystemIO conflicts with Region \PMIO 1 (20130517/utaddress-251)
  [   18.080316] ACPI Warning: 0x0000000000000530-0x000000000000053f SystemIO conflicts with Region \_SB_.PCI0.PEG0.PEGP.GPIO 1 (20130517/utaddress-251)
  [   18.080320] ACPI Warning: 0x0000000000000530-0x000000000000053f SystemIO conflicts with Region \GPIO 2 (20130517/utaddress-251)
  [   18.080324] ACPI Warning: 0x0000000000000500-0x000000000000052f SystemIO conflicts with Region \_SB_.PCI0.PEG0.PEGP.GPIO 1 (20130517/utaddress-251)
  [   18.080327] ACPI Warning: 0x0000000000000500-0x000000000000052f SystemIO conflicts with Region \GPIO 2 (20130517/utaddress-251)
  [   18.113551] ACPI Warning: \_SB_.PCI0.GFX0._DSM: Argument #4 type mismatch - Found [Integer], ACPI requires [Package] (20130517/nsarguments-95)
  [   18.113590] ACPI Warning: \_SB_.PCI0.GFX0._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20130517/nsarguments-95)
  [   18.159532] ACPI Warning: \_SB_.PCI0.GFX0._DSM: Argument #4 type mismatch - Found [Integer], ACPI requires [Package] (20130517/nsarguments-95)
  [   18.159565] ACPI Warning: \_SB_.PCI0.GFX0._DSM: Argument #4 type mismatch - Found [Integer], ACPI requires [Package] (20130517/nsarguments-95)
  [   19.299558] ACPI Warning: Evaluating _BQC failed (20130517/video-566)

  --- 
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  enzo       2423 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=215fb241-2ecd-41c9-a622-7e12673fb00b
  InstallationDate: Installed on 2012-12-14 (315 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: Dell Inc. XPS L421X
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic.efi.signed root=UUID=ca585b8f-dd71-4f9f-b83f-6f3f454318ce ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  Tags:  saucy
  Uname: Linux 3.11.0-12-generic x86_64
  UpgradeStatus: Upgraded to saucy on 2013-10-18 (7 days ago)
  UserGroups: adm cdrom debian-tor dialout dip lpadmin netdev plugdev sambashare sudo
  dmi.bios.date: 09/28/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 08HDPJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A12
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd09/28/2012:svnDellInc.:pnXPSL421X:pvrA12:rvnDellInc.:rn08HDPJ:rvrA00:cvnDellInc.:ct8:cvrA12:
  dmi.product.name: XPS L421X
  dmi.product.version: A12
  dmi.sys.vendor: Dell Inc.

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