I have it both on a MacBook Air 2011 11" and a MacBook Pro 2015 13"
This is a bug in 16.10 It did not exist in 16.04 It appears to be for ALL 16.10 kernels to date, ie. from 8/27/2016 onwards MacBook Pro: uname --kernel-release --kernel-version 4.8.0-27-generic #29-Ubuntu SMP Thu Oct 20 21:03:13 UTC 2016 MacBook Air: uname --kernel-release --kernel-version 4.8.0-27-generic #29-Ubuntu SMP Thu Oct 20 21:03:13 UTC 2016 It is triggered by not high temperture but some flawed conclusions Once kidle_inject launch they eat 50% of available cpu power forever Perhaps it is triggered by watching flash video from cnn in Chromium syslog when triggered: grep powerclamp /var/log/syslog Nov 17 10:04:22 c89 kernel: [82843.821614] intel_powerclamp: Start idle injection to reduce power reading temperatures on MacBook Pro: sensors | egrep "^(Right|Core|TCGC|TB0T)" Core 0: +69.0°C (high = +105.0°C, crit = +105.0°C) Core 1: +68.0°C (high = +105.0°C, crit = +105.0°C) Right Side : 3097 RPM (min = 1299 RPM, max = 6199 RPM) TB0T: +36.8°C TCGC: +71.0°C - the TCGC is GPU which is what supposedly should trigger about 85 °C Fix to next reboot: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1389077/comments/6 rmmod intel_powerclamp Across reboot fix: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1389077/comments/12 Just another bug in i915. Don’t expect a fix anytime soon, so just disable if it happens to your computer ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed ** Summary changed: - kidle_inject overly onerous, fans never used on MacBookPro12,1 + i915 intel_powerclamp consuming 50% cpu kidle_inject -- 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/1640000 Title: i915 intel_powerclamp consuming 50% cpu kidle_inject Status in linux package in Ubuntu: Confirmed Bug description: At least since upgrading to Yakkey, my MacBookPro12,1 (13", 2015) seems to respond to increased system heat using only kidle_inject, and not the built-in fan. kidle_inject with kick in rather quickly, especially with the Australian summer starting to be felt, and will render the system near useless. Doing some investigation, it appears that no fan is registered as a cooling device: > mjg@payens:~$ grep . /sys/class/thermal/cooling_device*/type > /sys/class/thermal/cooling_device0/type:Processor > /sys/class/thermal/cooling_device1/type:Processor > /sys/class/thermal/cooling_device2/type:Processor > /sys/class/thermal/cooling_device3/type:Processor > /sys/class/thermal/cooling_device4/type:intel_powerclamp Even though one is picked up by applesmc: > Nov 08 10:08:56 payens kernel: applesmc: key=670 fan=1 temp=35 index=34 acc=0 lux=2 kbd=1 The fan seems to be physically in good condition, I tested it out using the following: > root@payens:~# echo 6000 > /sys/devices/platform/applesmc.768/fan1_min Which started it blowing a lot of warm air out. ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: linux-image-generic 4.8.0.26.35 ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0 Uname: Linux 4.8.0-26-generic x86_64 ApportVersion: 2.20.3-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: mjg 3076 F.... pulseaudio /dev/snd/controlC0: mjg 3076 F.... pulseaudio CurrentDesktop: GNOME Date: Tue Nov 8 13:36:01 2016 HibernationDevice: RESUME=UUID=bc879a1f-ac27-48ae-82dd-3c81b7307dd0 InstallationDate: Installed on 2015-07-22 (475 days ago) InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 05ac:0273 Apple, Inc. Bus 001 Device 002: ID 05ac:8290 Apple, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Apple Inc. MacBookPro12,1 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-26-generic root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash acpi_backlight=vendor i915.fastboot=1 RelatedPackageVersions: linux-restricted-modules-4.8.0-26-generic N/A linux-backports-modules-4.8.0-26-generic N/A linux-firmware 1.161 SourcePackage: linux UpgradeStatus: Upgraded to yakkety on 2016-10-05 (33 days ago) dmi.bios.date: 09/28/2015 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP121.88Z.0167.B14.1509281135 dmi.board.name: Mac-E43C1C25D4880AD6 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro12,1 dmi.chassis.type: 9 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-E43C1C25D4880AD6 dmi.modalias: dmi:bvnAppleInc.:bvrMBP121.88Z.0167.B14.1509281135:bd09/28/2015:svnAppleInc.:pnMacBookPro12,1:pvr1.0:rvnAppleInc.:rnMac-E43C1C25D4880AD6:rvrMacBookPro12,1:cvnAppleInc.:ct9:cvrMac-E43C1C25D4880AD6: dmi.product.name: MacBookPro12,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. 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