[Expired for linux (Ubuntu) because there has been no activity for 60

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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  something prevents the cooler fan from spinning as fast as needed

Status in linux package in Ubuntu:

Bug description:
  Something in Ubuntu keeps my laptop's cooler fan from going at the
  speed that would be needed to keep the temperature within its safe

  The proof that something is wrong is that the computer overheats to
  the point that, first, the CPU starts to slow down to protect itself
  (you can tell the CPU has less power because trivial processes that
  barely do any work suddenly are consuming great percentages of CPU)
  and eventually even the computer shuts down (abruptly) to prevent
  itself from burning **AND** the fan speed doesn't get even close to
  its maximum speed while all this is happening.

  Note: I keep thermald turned off because of issue 1600599. I also disabled 
intel_powerclamp and intel_rapl to rule out that they were just kicking in 
before it's actually necessary.
  This has mitigated the issue, I'm pretty sure, but it has not solved it 

  Yes, my fan is full of dust and doesn't do its job very well, but if
  that alone was the issue, the fan should reach its top speed well
  before the CPU reaches critical temperature.

  The definitive proof that the fan *can* go faster is that, when the
  computer is overheating, if I restart it, at the grub screen, the fan
  spins a lot faster. Then, as the OS boots, its speed drops. Then you
  can also hear as the speed slowly diminishes, as if it was gradually
  slowing down because it's managing to keep the temperature under
  control. Except that the temperature keeps going up.

  Even by just suspending and resuming, the fan speed gets a noticeable
  boost (not as huge as by rebooting, for some reason), which is utter
  nonsense, and then soon slows down again.

  The huge increase in fan speed at restart just before boot (note: only
  when the computer is hot) proves that not only the fan can spin faster
  than the OS lets it, but also that the hardware "KNOWS" how fast it
  should spin. Either the hardware, assuming that no driver has been
  loaded yet when presented the grub screen, or some kind of more
  primitive driver that is loaded together with grub, I don't know.
  SOMETHING does know how to control the fan speed properly, and
  something that is started during boot imposes a wrong, lower speed.

  I assume that the fan speed is not regulated by a simple fixed map from 
temperature values to fan speed values. That would completely explain the 
behaviour (the fan is not as efficient as it is supposed to be, hence the 
predetermined speed values function of temperature are not enough), but it 
would be incredibly stupid. Please tell me that's not the case.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-79-generic 4.4.0-79.100
  ProcVersionSignature: Ubuntu 4.4.0-79.100-generic 4.4.67
  Uname: Linux 4.4.0-79-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.1-0ubuntu2.6
  Architecture: amd64
   /dev/snd/controlC0:  teo        2826 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Jun 13 01:49:34 2017
  HibernationDevice: RESUME=UUID=ff7e702a-a05a-47fd-8c14-551e81f9e9e3
  InstallationDate: Installed on 2013-10-11 (1340 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer Aspire V3-571G
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-79-generic.efi.signed 
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
   linux-restricted-modules-4.4.0-79-generic N/A
   linux-backports-modules-4.4.0-79-generic  N/A
   linux-firmware                            1.157.10
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-12-11 (183 days ago)
  dmi.bios.date: 10/15/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.07
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: VA50_HC_CR
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.07
  dmi.product.name: Aspire V3-571G
  dmi.product.version: V2.07
  dmi.sys.vendor: Acer

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