07-09-2019 11:14 AM
PC is a Carbon X1 Type 20KG.
Power modes just stopped working on Windows 10, both "better battery" and "best performace" have CPU locked at 800Mhz max frequency.
Task manager reports 2.11Ghz.
After reboot sometimes it becames normal ("better battery" locked at 2.11Ghz & "best performace"@4Ghz) but after a sleep or two it gets stuck @800Mhz.