I have been using Fedora 33 on a Lenovo Lenovo Legion 5 15ARH05H with GeForce RTX 2060 Mobile and Ryzen 7 4800h since last December, and there I encountered (like many other users) the problem that I could not get the brightness keys to work ever since.
I have tried many suggestions to fix this but it never worked. However, because it’s so long ago, I do not remember what I did.
Fast forward to now: I have upgraded to Fedora 34 and the brightness keys still do not work. In addition to this, the displayed colors are off, as in: too saturated. Most notably, green and red are very flashy.
I don’t know if these problems are related. However, I strongly suppose that at least the brightness problem can be fixed: if I boot from a Fedora34 USB drive, the brightness keys are working! I assume that I have changed some settings or files on Fedora33 and that these changes migrated to F34 upon upgrading.
Does anyone know which files/settings I could check out and change to fix this problem?