Notable upstream bugs with related issues alegidly patched: https://bugzilla.kernel.org/show_bug.cgi?id=115771 maybe not patched yet: https://bugzilla.kernel.org/show_bug.cgi?id=93521
Workaround (to help other who find this bug) Add `intel_pstate=disable` to `GRUB_CMDLINE_LINUX_DEFAULT` in /etc/default/grub and update-grub. This will revert to the acpi-cpufreq driver and ondemand (default) policy. check with `cpupower frequency-info` I've observed more sane scaling of CPU frequencies, and better fan speed and temperature on Haswell. E.g. acpi-cpufreq vs pstate (while relatively idle) * temp: ~52 vs 70 degrees * fan: ~3800 rpm vs 4600 rpm pstate will very often turbo boost many cores and seldom drop below standard max frequency even when lightly loaded per core. When loaded, temp would bounce up to 89 degrees quickly. I suspect the CPU kept needing to throttle back often. ** Bug watch added: Linux Kernel Bug Tracker #115771 http://bugzilla.kernel.org/show_bug.cgi?id=115771 ** Bug watch added: Linux Kernel Bug Tracker #93521 http://bugzilla.kernel.org/show_bug.cgi?id=93521 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1598394 Title: intel_pstate has too aggressive frequency selection To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1598394/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
