On Wed, Apr 22, 2009 at 06:10:08PM +0000, Salvatore Lionetti wrote: > > Hi > > Many thanks for your attention. > > - The controller is HS only, It is? What type is it? > so FS device like > http://www.trust.com/products/product.aspx?artnr=14134 i'm using is > not recognized at all without hub, Yes, that would be a problem. > - When i start submit urb for recording, no other kind of urb is/'ll > be started before got error. Moreover the playback bandwidth is 4 > times higher than record one, since there exist 4 stero output ch. > Follow the layout of isoc urb: > o Playback urb: 1 packet, 704 bytes each (44 sample, 4ch, 16bit, stereo) > o Record urb: 1 packet, 200 bytes each (100 sample, 1ch, 16bit, stereo) > Is possible to saturate bus with Record and not for Playback direction? Possibly, yes. Again, using a FS device through a hub is very difficult, and there can be lots of issues. I would never recommend it for any audio devices that you care about latency and playback. You will be much better off just buying correct hardware. good luck, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
