Laurent Pinchart wrote: > On Monday 07 May 2007, Andreas Volz wrote: >> Am Sun, 6 May 2007 22:10:25 +0200 schrieb Laurent Pinchart: >> >>> Are you using a USB 1.1 device behind a hub ? Error 38 is ENOSYS, and >> On the hub is a big "USB 2.0" sign. > > Problems arise (if I'm not mistaken) when you use a USB 1.1 device with a USB > 2.0 hub. Protocol handling becomes much more complex for the Linux USB stack, > and that code is still experimental.
You're not mistaken :) It is even worse for isochronous transfers which video devices usually use. It gets even worse if you connect _multiple_ usb 1.1 devices to your usb 2.0 hub. Andreas, if you're compiling your own kernel, you can try to set USB_EHCI_SPLIT_ISO and USB_EHCI_TT_NEWSCHED to see if that helps. Please note that these are experimental features and haven't been through a lot of debug time yet. The simplest solution, however, is to connect the camera directly to the PC... :( -- Paulo Marques Software Development Department - Grupo PIE, S.A. Phone: +351 252 290600, Fax: +351 252 290601 Web: www.grupopie.com "God is love. Love is blind. Ray Charles is blind. Ray Charles is God." _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
