This is an update to our post from yesterday X1 Carbon 6th gen about 50% slower on Linux.
Based on the Intel datasheet on my CPU (i7-8550U), it seems that with the 'fix' enabled, the CPU potentially draws a lot more power for longer times than it is designed to do (see the TDP numbers in the sheet). This whole clocking issue seems to be an issue for people that really know what they're doing - and I feel I don't have all the information to make a reasonable decision to overrule the defaults. I have the feeling that the CPU can do 4GHz, but isn't supposed to do it for longer than a couple of seconds, because then it would get too hot and draw too much power.
Since I was content with the speed of the machine before the fix and I don't want to run the danger of melting my machine, I'm personally going to disable the fix. I know that some people have been running with the 'fix' present on their machines for months, so I'm not saying that it's the wrong thing to do. I'm just personally going to tread on the safe side.
Since the 'fix' ran through an
install.sh script and wasn't
available as a package, uninstalling has to be done by hand. However,
install.sh script reveals all the points that need to be done:
systemctl stop lenovo_fix.service rm /etc/systemd/system/lenovo_fix.service rm /etc/lenovo_fix.conf reboot
The above script leaves the three packages installed through pip and whatever OS packages you installed still on your system. I don't want to issue a remove script for those, because you might be using them for something else and I don't want to break your system.