How to remove noise in speakers?

After my operating system boots, I can hear repeatedly scratch-like noise from speakers. I googled this problem, and almost found solutions somewhere: if I type like a echo 0 | sudo tee /sys/module/snd_hda_intel/parameters/power_save in terminal, then type a password, this command echoes "0" and noise dissipates. Solution is deficient since its annoying to type the same command every time when booting. Then I have couple more questions: 1. Should I create a new command somewhere in startup scripts to get rid of scratch? Somewhy I wonder if its a good idea, but if so, is this page what needs to be followed? I dont have systemd, but runit. 2. What does "echo" do in this bash command? When reading "man echo" I knew only, its needed for variables output etc. P.S. I have Cinnamon DE, if it does matter.