Comment 8 for bug 1598394

I recently bought a new Lenovo IdeaPad 520-15IKB 81BF005JRK laptop and installed Ubuntu (18.10 downloaded a few days ago, during install, updates were installed). But I cannot work with it as immediately after turning on the laptop, the processor (i8520u) on all cores operates at maximum frequencies (over 3 GHz) and goes into hard trotting with pauses of 20-30 seconds. I have some time open the console, but I can not execute any command. It's owful.
I cann't install cpufrequtils, cpupower or other software

 I tried to boot from a live-usb (there are no such problems) and edit /boot/config-* :
#CONFIG_CPU_FREQ_GOV_PERFORMANCE
CONFIG_CPU_FREQ_GOV_POWERSAVE=y

the governor was established to POWERSAVE but the laptop still works at the maximum frequency.
may be I can Add `intel_pstate=disable` to `GRUB_CMDLINE_LINUX_DEFAULT` in /etc/default/grub
but I don't know how update-grub at GPT UEFI partition.

It even sometimes seems to me that with each new start in such a boost it slows down more and more, I'm afraid, as it were, that it does not kill the processor on a new computer. After the first installation, I didn’t immediately notice trotting and left the computer for the night. And now it's just not possible to work with him