Hi Many thanks for your attention. - The controller is HS only, so FS device like http://www.trust.com/products/product.aspx?artnr=14134 i'm using is not recognized at all without hub, - 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? Thanks in advance for time spent in this issue. Have a good day. P.S: The kernel i'm using is 2.6.26, the board an 'embedded' fon 2.0. Using instead my PC, kernel 2.6.15, which have any type of controller {E,U,H]CI, HUB and then audio device neither playback/record is possible. Removing ehci_hcd the pb disappear and all start to work. It seem that is a sw issue (not saying that device is well implemented ...) --- Mar 21/4/09, Greg KH <greg@xxxxxxxxx> ha scritto: > Da: Greg KH <greg@xxxxxxxxx> > Oggetto: Re: Audio driver on 2.6.26 over an HUB > A: "Salvatore Lionetti" <salvatorelionetti@xxxxxxxx> > Cc: linux-usb@xxxxxxxxxxxxxxx > Data: Martedì 21 Aprile 2009, 20:20 > On Tue, Apr 21, 2009 at 10:06:30AM > +0000, Salvatore Lionetti wrote: > > > > Hi > > > > I'm using an hub to use FS device over an HS only > controller, NEC D720102GC. > > Ick, do you have to? That's the toughest thing to do > with USB :( > > > - The device has 2 isoc EP, 1 ctrl, 1 intr > > - Playback works great! > > - Recording return 28 (ENOSPC) every time dd submit an > urb. > > > > Can someone give me some hint regard such issue? > > Your bandwidth is full. Try plugging the device > directly into the USB > connection on your machine, that should work better. > > thanks, > > 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
