Comment 6 for bug 1838141

Does the problem go away if "intel_pstate=disable" is provided in kernel cmdline?
There were many accounts of CPU being stuck at 800MHz, and they were not caused by OS at all:
 https://forums.bit-tech.net/index.php?threads/solved-laptop-stuck-at-800mhz.338423/
 https://linustechtips.com/main/topic/531278-skylake-system-stuck-at-800mhz/
 https://www.dell.com/community/Laptops-General-Read-Only/Dell-XPS-9550-CPU-Multiplier-Stuck-at-8/td-p/4740654