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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1640000 Title: i915 intel_powerclamp consuming 50% cpu kidle_inject To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1640000/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
