After installing the v4.7-rc7 mainline build kernel I can confirm that this bug still exists.
I installed the following 3 debs with sudo dpkg -i *.deb: linux-headers-4.7.0-040700rc7_4.7.0-040700rc7.201607110032_all.deb linux-headers-4.7.0-040700rc7-generic_4.7.0-040700rc7.201607110032_amd64.deb linux-image-4.7.0-040700rc7-generic_4.7.0-040700rc7.201607110032_amd64.deb Next, I rebooted the laptop and confirmed I was running on 4.7 with uname -r: 4.7.0-040700rc7-generic I used the laptop for a few minutes until the fans came on. The fans continued to run, and are still running 30 minutes later. Here's the output of lm-sensors showing that the cpu is cool, yet the fans are spinning away. dell_smm-virtual-0 Adapter: Virtual device Processor Fan: 1935 RPM Processor Fan: 2134 RPM CPU: +33.0°C GPU: +1.0°C SODIMM: +45.0°C Other thoughts - I don't know if this is relevant to the fan issue, but in powertop under the "idle stats" tab, the CPU package never gets past C2. This is the case with all kernels I've tried. Perhaps the fan issue is related to the screwy skylake power management? I've attached a text file of the powertop idle stats with the 4.7 kernel. ** Attachment added: "powertop-idle-4.7rc7.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1602888/+attachment/4701811/+files/powertop-idle-4.7rc7.txt ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed ** Tags added: kernel-bug-exists-upstream kernel-bug-exists- upstream-4.7-rc7 -- 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/1602888 Title: Dell Inspiron 7559 fans do not shut off once started, even when cool Status in linux package in Ubuntu: Confirmed Bug description: Running Ubuntu 16.04 on a Dell Inspiron 7559 laptop there appears to be an issue with the fan control. When I first boot up the machine the fans are off. However, after the laptop warms up under normal usage, the fans kick on and then never shut off again. Even when the CPU cools down to below 35c, the fans will continue to run. If I suspend the the laptop, and then immediately wake it up again then fans are once again off, until it warms up again. So essentially, once the fans start they don't seem to ever shut off. Fans seem to work normally under Windows 10. They turn on as needed, and then turn off once the laptop cools down. I've tried the various BIOS updates that Dell has released, without success. I am currently running Dell's latest BIOS for this laptop (v1.1.8) Below is the output of lm-sensors showing the fans running when the CPU is at a cool 35c dell_smm-virtual-0 Adapter: Virtual device Processor Fan: 1925 RPM Processor Fan: 2143 RPM CPU: +35.0°C GPU: +1.0°C SODIMM: +49.0°C ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-28-generic 4.4.0-28.47 ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13 Uname: Linux 4.4.0-28-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bob 1709 F.... pulseaudio CurrentDesktop: Unity Date: Wed Jul 13 19:18:45 2016 HibernationDevice: RESUME=UUID=14de580b-76f3-47e4-9850-fe7637f9ff77 InstallationDate: Installed on 2016-07-13 (0 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) MachineType: Dell Inc. Inspiron 7559 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic.efi.signed root=UUID=0b3dbcf3-0bdb-4c35-9200-7bb303055a81 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-28-generic N/A linux-backports-modules-4.4.0-28-generic N/A linux-firmware 1.157.2 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/17/2016 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.1.8 dmi.board.name: 0H0CC0 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvr1.1.8:bd04/17/2016:svnDellInc.:pnInspiron7559:pvr1.1.8:rvnDellInc.:rn0H0CC0:rvrA00:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: Inspiron 7559 dmi.product.version: 1.1.8 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1602888/+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
