Hi, I have a ThinkPad P16v Gen 1 (AMD) with Windows 11 and Fedora Silverblue installed. When recording audio in Fedora, I’ve noticed that the input has some constant positive DC. The right channel has more than the left channel.
I have already tried:
I don’t even know where to begin fixing this. Can someone help? Thanks!
What do you mean by DC? direct current?
Hmmm … this does not sound right.
Are you hearing a humming noise (hummmmm) or hissing (hissssss) or are you seeing a flat line on a graphical sound output kind of display?
IF it is a “hummmmm” then this would be A/C leakage (open-ground noise) into your input (mic/direct analog audio). To reduce or eliminate this, check your grounds between the audio source and the computer and reduce/adjust your input gains until the noise is at its minimum. If you have a mic and recording that way, try moving your mic further from any A/C current source, like get it away from any power-brick or monitor for example.
IF it is “hisssss” or a fuzzy looking flat line on a graph then this could be hissing/white/pink noise on the input OR a noisy amplifier/audio system in the computer itself. Try reducing the amplification/volume on the output side or the gain on the input side until this noise is minimized.
IF the flat line is actually completely flat, no spike/fuzzy appearance, then you have D/C on the output. IF you see this, your amplifier output likely has a shorted capacitor … and if this is in the computer, you basically are not going to be able to fix this.