I recently got a Thinkpad X1 Carbon Gen 9 laptop. On Ubuntu 20.04 LTS it was overheating under load. It took me a few hours but I figured out a fix. I blogged about it so hopefully no one has to comb through forum posts to solve this problem again.
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@darius since you mentioned secure boot on the X1, note that there is a `WONTFIX` security issue related to the MOK key that DKMS generated that allows a local adversary to sign new kernel modules and bypass lockdown protections. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1883949
