For some reason I couldn't get KDE to properly control my screen brightness through DDC over HDMI. Turns out the nvidia driver breaks this by default. Why‽ To fix it, I add the following to a config file:
/etc/modprobe.d/nvidia-graphics-i2c.conf
options nvidia NVreg_RegistryDwords=RMUseSwI2c=0x01;RMI2cSpeed=100

If I had not found this on a random website, how on earth am I as an average user supposed to debug this?

Once again, nvidia/linux makes it more difficult to do something that on windows would work just fine.

#KDE #Linux #Nvidia