The importance of this bug should obviously be critical, not medium.
It meets all the criteria, plus it may even cause hardware damage.
** Changed in: linux (Ubuntu)
Status: Expired => Confirmed
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1697567
Title:
something prevents the cooler fan from spinning as fast as needed
Status in linux package in Ubuntu:
Confirmed
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
range.
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
completely.
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
AudioDevicesInUse:
USER PID ACCESS COMMAND
/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
RelatedPackageVersions:
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.modalias:
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
dmi.product.name: Aspire V3-571G
dmi.product.version: V2.07
dmi.sys.vendor: Acer
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1697567/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
