I dubt this has anything to do with the kernel. I'm not testing the upstream kernel. Please don't leave this bug in the "incomplete" status or it will starve without anybody doing anything to fix it.
> Did this issue start happening after an update/upgrade? > Was there a prior kernel version where you were not having this particular > problem? I don't know. I have been observing this for years. Ages ago, however, on another computer with Ubuntu 12.something I didn't experience the issue, and I can tell because the fan was also old and would not do its job very well (much worse than my current one), and it was spinning very fast all the time as one would expect in that situation. -- 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: Incomplete 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
