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[Oliver Joos <1290110@xxxxxxxxxxxxxxxxxx>]

** Summary changed:

- Fan stops after resume from suspend leading to overheating; requires reboot to fix [HP Probook 4710s]
+ Fan stops after resume from suspend leading to overheating; requires reboot to fix [HP Probook 4710s and many others]

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Title:
  Fan stops after resume from suspend leading to overheating; requires
  reboot to fix [HP Probook 4710s and many others]

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  After resume from suspend, the fan (there is only one) first speeds up to about a normal speed and then slows down in a couple of seconds to a complete stop. It doesn't spin up again even if the temperatures shoot way up (monitoring using indicator-sensors or lm-sensors, both use acpitz info).
  There are 2 ways to get the fan spinning again:
  - reboot the system
  - echo 1 > /sys/class/thermal/cooling_device[4|12...don't remember which]/curr_state

  This is happening on a clean install of Trusty from daily build that also has the updates-proposed source enabled. Previously the laptop ran 13.10 and suspend and resume worked fine.
  Only thing is, I also updated the BIOS during formatting for Trusty, which could cause this issue but I'm leaning more towards an ACPI issue (the latest BIOS is from 2010 and someone would have probably noticed a problem with the fan?)

  Attached is the output from cd /sys/class/thermal && grep . */*
  2&>/dev/null after first boot and after resume suspend; as can be
  seen, after resume all fan states are 0 whereas on boot some are also
  1.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-16-generic 3.13.0-16.36 [modified: boot/vmlinuz-3.13.0-16-generic]
  ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
  Uname: Linux 3.13.0-16-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jernej     2582 F.... pulseaudio
   /dev/snd/controlC0:  jernej     2582 F.... pulseaudio
  CurrentDesktop: Unity
  CurrentDmesg:
   [   78.199783] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
   [  104.824460] audit_printk_skb: 147 callbacks suppressed
   [  104.824464] type=1400 audit(1394393526.590:61): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=1986 comm="apparmor_parser"
   [  104.824472] type=1400 audit(1394393526.590:62): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=1986 comm="apparmor_parser"
   [  104.824884] type=1400 audit(1394393526.590:63): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=1986 comm="apparmor_parser"
  Date: Sun Mar  9 20:46:48 2014
  HibernationDevice: RESUME=UUID=79b35f90-100a-4582-9b65-a84fbedf5bf7
  InstallationDate: Installed on 2014-03-08 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140308)
  MachineType: Hewlett-Packard HP ProBook 4710s
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-16-generic root=UUID=9561bd56-ffa3-4f61-91cf-019c359ed8e8 ro quiet splash radeon.dpm=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-16-generic N/A
   linux-backports-modules-3.13.0-16-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/02/2010
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68PZI Ver. F.18
  dmi.board.name: 3074
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 24.0F
  dmi.chassis.asset.tag: CNU9465LRD
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68PZIVer.F.18:bd12/02/2010:svnHewlett-Packard:pnHPProBook4710s:pvrF.18:rvnHewlett-Packard:rn3074:rvrKBCVersion24.0F:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 4710s
  dmi.product.version: F.18
  dmi.sys.vendor: Hewlett-Packard

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