Clemens Ladisch wrote:
I'd like to know if playback and/or MIDI work. It may be possible that the driver doesn't send playback PCM data at exactly the correct rate because the playback stream should have been synchronized to the capture stream.
I don't have any MIDI hardware to hand at the moment: I can try to dig out my old Roland drum machine next week if that will help.
Meanwhile, I've tried playback (with jack 0.100.1, ardour, & realtime_lsm loaded).
With kernel 2.6.12 + "[PATCH] ehci-hcd - fix page pointer allocation in itd_patch()"), using jackd in realtime mode at 44.1kHz with 64 frames/period and 4 periods/buffer, I get a stream of xruns of about 0.020 ms, several per second.
Using the same kernel and jackd settings, but with the sound/ and include/sound directories from ALSA CVS of about 7:30 this evening, it seems to work fine, at least for a couple of minutes of stereo playback.
At 128 frames/period, both kernels have a crackling background noise: I haven't experimented with any other settings yet.
I hope this is useful: I'm afraid I'm not going to have time to try much more until next week now.
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