2012-11-30 下午5:01 於 "David Henningsson" <<a href="mailto:david.henningsson@canonical.com">david.henningsson@canonical.com</a>> 寫道： > > Hi, > > I'm researching a bug where some set of USB speakers stopped working, probably in 2.x. The peculiar thing about this sound card is that seems to only work at a sample rate of 46875 Hz. > > So in 2.x, the probe fails with > "E: [pulseaudio] alsa-sink.c: Failed to find any supported sample rates.", whereas in an earlier version, it would just happily work at 46875 Hz instead, as I understand it. > > So my first question is; why do we check all these rates, when we end up just alternating between default-sample-rate (44100 Hz) and alternate-sample-rate (48000 Hz) anyway? > And second, can we try not to fail if we can't find any supported sample rates, so we can fix this regression? <a href="http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/daemon/daemon-conf.c?id=5bcfd2b630ae56c97348edc93c4c237f71b24283">http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/daemon/daemon-conf.c?id=5bcfd2b630ae56c97348edc93c4c237f71b24283</a> Since pulseaudio 2.0 require sound card support sample rate which are multiple of 4000 and 11025 > > For reference, this is the bug (with pulse verbose logs in it): > > <a href="https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1074783">https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1074783</a> >