On Wed, Jun 21, 2017 at 10:10 PM, John Jason Jordan <[email protected]> wrote:
> On Wed, 21 Jun 2017 15:45:29 -0700 > Denis Heidtmann <[email protected]> dijo: > > >I do not know much about what you describe, but you could answer the > >frequency issue by recording the sound into Audacity on the laptop. > >(Assuming you do not have a 'scope.) > > > >Is there a chance that the connections which produce the hum include > >two different AC powered devices with a (not quite) common ground? > > Since my original message I have discovered that the hum goes away > on the desktop if I turn off the right channel in Pulseaudio (the movie > has only stereo, not 5.1). I have no idea what this means. > > You probably turned down the microphone input or the line-in input or something like that. Those inputs can cause hum even if there is no device connected to them. If you haven't already you should probably not just turn them down, but mute them and any other inputs you are not using. In alsamixer you maneuver to the device and hit the letter m to mute, your mixer may vary. Bill _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
