I found a workaround by rmmod intel_powerclamp. This removed the kidle_inject threads and the speed was returned to normal.
However, I looked at my CPU temperature, and it was 87 deg C, over the high threshold. It is possible that the idle injection is a new kernel feature that is kicking in to protect my CPU from overheating. Perhaps in older kernels I didn't have any protection or there was a different mechanism. Or perhaps something in the new kernel is causing the CPUs to run hot. I suppose this bug could be closed, since it is possible that the symptom is actually a feature. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1389077 Title: [HP ProBook 4530s] Intel Powerclamp is Slowing CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1389077/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
