I think I have identified where the problem lies: in the underrun handling of the playback stream. I don't know what causes the underrun, but the recovery mechanism does not have the desired effect, so both capture and playback remain frozen.
In the attached path, which is not of production quality, I call AlsaRestart when a playback underrun is detected. That seems to recover the situation without causing apparent problems but it is probably too blunt to be acceptable as a long-term solution. I am, after all, completely unfamiliar with alsa programming. The patch also contains some output statements in the affected functions, producing the following console output: playback xrun capture xrun AlsaRestart playback xrun capture xrun AlsaRestart playback xrun capture xrun AlsaRestart [repeated] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/355846 Title: audacity stops recording after about a second when using software play-through -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
