Re: [alsa-devel] Fw: BUG: Kernel panic when disconnecting Edirol USB2 audio interface

[Colin Fletcher <colinf@axicon.com>]

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.

Colin Fletcher

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