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[Reece <reece@xxxxxxxxx>]

Same  here for the following system upgraded to 15.04 from 14.10
yesterday...

System Information
	Manufacturer: Dell Inc.
	Product Name: XPS L421X
	Version: A04
	Serial Number: JG74GS1
	UUID: 4C4C4544-0047-3710-8034-CAC04F475331
	Wake-up Type: Power Switch
	SKU Number: xxx123x#ABA
	Family: 103C_5335KV

This also seems relevant...

Handle 0x0028, DMI type 27, 14 bytes
Cooling Device
    Temperature Probe Handle: 0x0029
    Type: Fan
    Status: OK
    OEM-specific Information: 0x00000000
    Nominal Speed: 0 rpm   # while the fan is audibly running!

Handle 0x0029, DMI type 28, 22 bytes
Temperature Probe
    Description: Temperature Probe
    Location: Processor
    Status: OK
    Maximum Value: Unknown
    Minimum Value: Unknown
    Resolution: Unknown
    Tolerance: Unknown
    Accuracy: Unknown
    OEM-specific Information: 0x00000000
    Nominal Value: 2594.0 deg C

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https://bugs.launchpad.net/bugs/1448441

Title:
  After upgrade to Ubuntu 15.04, wrong temperature readings after wake
  from suspend cause fan to go crazy

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After I upgraded to Ubuntu 15.04, I started having problems with the
  fan going crazy after I wake Ubuntu from suspend. At first, this only
  happened on a few occasions when waking Ubuntu from suspend, but now
  it seems to happen every time I wake it from suspend.

  I'm guessing the fan goes full speed due to the wrong readings of the
  temperature. "sensors" indicates temp4 as 100°C right after I wake
  Ubuntu from suspend, but temp4 is usually only around 30-40°C.

  The problem goes away when I restart Ubuntu. I had no problems of this
  kind on previous versions of Ubuntu.

  I'm not sure if the package responsible is "linux", but I assume it is
  because of this:
  https://wiki.ubuntu.com/Bugs/FindRightPackage#Suspend_and_Hibernate

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-15-generic 3.19.0-15.15
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic i686
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  macak      1564 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Apr 25 13:47:17 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-04-21 (3 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release i386 (20141022.1)
  MachineType: Hewlett-Packard HP Compaq 6910p (RH239AV)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-15-generic root=UUID=d68e56a7-69e6-43ce-b25b-20550f5e34bf ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-04-24 (1 days ago)
  dmi.bios.date: 11/04/2008
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68MCD Ver. F.17
  dmi.board.name: 30C1
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 68.36
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68MCDVer.F.17:bd11/04/2008:svnHewlett-Packard:pnHPCompaq6910p(RH239AV):pvrF.17:rvnHewlett-Packard:rn30C1:rvrKBCVersion68.36:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Compaq 6910p (RH239AV)
  dmi.product.version: F.17
  dmi.sys.vendor: Hewlett-Packard

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