From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin Fletcher Subject: Re: [alsa-devel] Fw: BUG: Kernel panic when disconnecting Edirol USB2 audio interface Date: Mon, 27 Jun 2005 22:32:34 +0100 Message-ID: <42C07072.1050105@axicon.com> References: Reply-To: colinf@axicon.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-usb-devel-admin@lists.sourceforge.net Errors-To: linux-usb-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Clemens Ladisch Cc: linux-usb-devel@lists.sourceforge.net, alsa-devel@lists.sourceforge.net, david-b@pacbell.net List-Id: alsa-devel@alsa-project.org 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 -- ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel