The upcoming 5.6 kernel now includes some generic CPU cooling improvements by basically injecting idle instructions as needed to cool down the CPU. While it doesn’t reduce the clock speed during idle, it could help the phone from shutting off from overheating, battery burning through faster due to efficiencies lost from heat, etc. I believe 5.6 will likely come out late March-ish and was curious if any Purism folk or folk holding a Librem5 plan to do any tests with the new kernel via the -rc releases or something to see what improvements can be had in advance of the Dogwood or Evergreen launch.
https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.6-Generic-CPU-Cool-Idle