Might be related to the radeon HD audio device. I have Radeon HD 5000 graphics card with HDMI output and the audio works quite ok with alsa, but jackd gives tons of xruns, no matter what period/buffer settings I try. This BUG could be the reason for that. I'm getting this:
BUG: pcmC1D0c:0, pos = 5461, buffer size = 5461, period size = 2730 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1305480 Title: BUG: pcmC0D0p:0, pos = 16390, buffer size = 16384, period size = 1024 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1305480/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs