I have the following problem. As soon as the battery drops below 30%, the CPU is being throttled to 500Mhz. As soon as I plug in the power adapter, it goes back to normal. The laptop is a Lenovo U41-70, I am running Ubuntu 15.10 x64, the CPU is an Intel i3-5020U.
I am not sure if this is helpful, but while it's on battery and below 30%,
lscpu (same values from
cat /proc/cpuinfo) still gives out:
CPU MHz: 499.984 CPU max MHz: 2200,0000 CPU min MHz: 500,0000
When it's plugged in, CPU MHz immediately jumps up to 2195.015Mhz when there is load on the CPU, which is fine of course.
What could cause this problem? I don't have Windows installed so I don't know if the problem exists there as well.