https://github.com/cszach/linux-on-lenovo-legion
- fedora
- links to LenovoLegionLinux for fan control
https://laptopwiki.eu/laptopwiki/guides/lenovo/legion5_2021_linux
- maybe too generic for your problems
https://github.com/wottreng/Linux-Mint-on-Lenovo-Legion-5
- mint
https://github.com/johnfanv2/LenovoLegionLinux
- extra software and kernel stuff
- many distros supported
- mentions high fan speed
some mentions of „battery saver mode“ and nvidia gpu misbehaving with old driver.
search term: „lenovo legion 5 pro linux“ search engine: duckduckgo