Comment 19 for bug 1769236

Upstream kernel 4.17.0-rc4 didn't change performance.

Recall that I installed Kubuntu. Since then I have installed ubuntu-gnome-desktop, in case that provided some missing configuration file.

With either kernel, I get this behavior:
- I boot the laptop.
- Instead of logging into a desktop environment, I use virtual terminals.
- Usually /proc/cpuinfo shows all 8 CPUs running at 900 MHz, give or take a few Hz. Sometimes it shows 400 MHz, but it soon rises to 900 MHz.
- I run the c-ray benchmark. CPU frequency rises to 2400 MHz, and stays there for tens of seconds, then drops to 400 MHz.
- The laptop does not become warm, and the fans do not spin up.
- I kill c-ray. A few minutes later, CPU frequency rises from 400 MHz back up to 900 MHz.
- kern.log contains "intel_powerclamp: Start idle injection to reduce power" within seconds of the times when the frequency drops to 400 MHz, and "intel_powerclamp: Stop forced idle injection" when it rises to 900 MHz.

Is the cooling system failing to activate the fans, or overreacting to CPU temperatures in some way?