At Tue, 3 Jul 2007 17:02:49 -0600, Howdy Pierce wrote: > > Takashi Iwai wrote: > > Howdy Pierce wrote: > >> I'm encountering the following problem on Fedora Core 6 running on a Dell > >> Optiplex 745. This is a pretty vanilla computer with an ICH8 chipset and > >> integrated AD1983 sound capabilities. > >> > >> I have wired up a funky line-input cable so that I have completely > >> separate audio sources playing on the left and right inputs. > >> > >> When I either play these through to the speaker output directly (using > >> alsamixer), or record the audio using arecord, the result is that there > >> is a slight bit of bleeding or crossover, so I can faintly hear the left > >> input on the right channel, and vice versa. If I record a wav file and > >> then play it on another computer, the left/right bleeding follows the wav > > >> file, so it seems that the problem is in the capture process somehow. > >> > >> When I install Windows XP onto the same machine, the problem disappears, > >> so I can rule out hardware errors. > >> > >> The application I'm working on relies on being able to reliably capture > >> the right and left channels of audio independently. Since the problem > >> can be seen using the standard arecord/aplay tools, though, I don't think > > >> it's my code. > >> > >> I've tried all the possible combinations inside alsamixer, and I don't > >> think there's anything I've messed up there. > > > > To investigate where the problem exists, try to use "hw" PCM first > > without alsa-lib plugins. If the problem still remains, it's in the > > driver (that I don't expect since your codec dump looks sane to me). > > Thanks for the response. > > I assume you want me to record something with > arecord --device=hw:0,0 > ? Yes. > The problem still exists with that command line. Where do I need to look > next -- the kernel driver? Any theories as to what might be happening here? > Has anyone seen something similar before, perhaps on other hardware? No, I've never heard such a (software) problem on other hardwares. What about the recording from mic input? (You have "Mic Boost" there, too). Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
