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[Kaijia Feng <fengkaijia@xxxxxxxxx>]

Sorry for the late reply, just installed daily build 20160117 and the
temperature has been further lowered to some 45°C.

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https://bugs.launchpad.net/bugs/1482944

Title:
  3.13.0-58 (also 3.13.0-59, 61) bursting Lenovo Y470N

Status in linux package in Ubuntu:
  Expired

Bug description:
  Update: it seems that this change happened in 3.13.0-58, not
  3.13.0-59.

  I observed the temperature for a hour running in 3.13.0-58 and
  3.13.0-57 without any operation. And found that the temperature using
  3.13.0-57 is only around 50°C. So it seems that the problem started at
  3.13.0-58 and was getting worse ever since.

  Here is the temperature in 3.13.0-57 when writing this update.

  ~$ sudo sensors
  acpitz-virtual-0
  Adapter: Virtual device
  temp1:        +48.0°C  (crit = +127.0°C)

  coretemp-isa-0000
  Adapter: ISA adapter
  Physical id 0:  +49.0°C  (high = +86.0°C, crit = +100.0°C)
  Core 0:         +49.0°C  (high = +86.0°C, crit = +100.0°C)
  Core 1:         +47.0°C  (high = +86.0°C, crit = +100.0°C)

  ----

  I noticed my Lenovo Y470N is really hot after switching to kernel
  3.13.0-61. Then I installed 3.13.0-59 (which I didn't use before) to
  have a test and had the similar phenomenon.

  Prior to 3.13.0-59, the usual temperature of my Y470N is around 60°C.

  ~$ sudo sensors
  acpitz-virtual-0
  Adapter: Virtual device
  temp1:        +56.0°C  (crit = +127.0°C)

  coretemp-isa-0000
  Adapter: ISA adapter
  Physical id 0:  +57.0°C  (high = +86.0°C, crit = +100.0°C)
  Core 0:         +57.0°C  (high = +86.0°C, crit = +100.0°C)
  Core 1:         +56.0°C  (high = +86.0°C, crit = +100.0°C)

  When I was using 3.13.0-59 or 3.13.0-61. The temperature never goes
  down to 65°C. In most cases, it's around 70°C.

  ~$ sudo sensors
  [sudo] password for fkj:
  acpitz-virtual-0
  Adapter: Virtual device
  temp1:        +66.0°C  (crit = +127.0°C)

  coretemp-isa-0000
  Adapter: ISA adapter
  Physical id 0:  +70.0°C  (high = +86.0°C, crit = +100.0°C)
  Core 0:         +70.0°C  (high = +86.0°C, crit = +100.0°C)
  Core 1:         +65.0°C  (high = +86.0°C, crit = +100.0°C)

  After surfing the web for half an hour  this can even up to 90°C. For
  example, here's the sensors result after I finish typing this bug
  report.

  ~$ sudo sensors
  acpitz-virtual-0
  Adapter: Virtual device
  temp1:        +84.0°C  (crit = +127.0°C)

  coretemp-isa-0000
  Adapter: ISA adapter
  Physical id 0:  +87.0°C  (high = +86.0°C, crit = +100.0°C)
  Core 0:         +87.0°C  (high = +86.0°C, crit = +100.0°C)
  Core 1:         +83.0°C  (high = +86.0°C, crit = +100.0°C)

  As a result the fan is getting louder and louder every time. And I can
  sense the taste of burnt at the air vent.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-59-generic 3.13.0-59.98
  ProcVersionSignature: Ubuntu 3.13.0-59.98-generic 3.13.11-ckt22
  Uname: Linux 3.13.0-59-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  fkj        3006 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Aug  9 10:46:57 2015
  HibernationDevice: RESUME=UUID=17bae1a9-aae0-4a5e-b7b8-4302afae0ed2
  InstallationDate: Installed on 2014-04-21 (474 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20090
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-59-generic root=UUID=a126e324-8d74-496b-8a81-2ce336c46673 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-59-generic N/A
   linux-backports-modules-3.13.0-59-generic  N/A
   linux-firmware                             1.127.14
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/28/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 47CN31WW(V2.09)
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Base Board Product Name
  dmi.board.vendor: LENOVO
  dmi.board.version: Base Board Version
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnLENOVO:bvr47CN31WW(V2.09):bd10/28/2011:svnLENOVO:pn20090:pvrLenovoIdeaPadY470:rvnLENOVO:rnBaseBoardProductName:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.name: 20090
  dmi.product.version: Lenovo IdeaPad Y470
  dmi.sys.vendor: LENOVO

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