On Thu, 28 Oct 2010, Daniel Stöckner wrote: > I just saw, that my mail from yesterday didn't go to the list with the > attachment. So here once again with a link instead: > > http://www.stoeckner.net/linux/usbmon_and_uhci.tar.bz2 > > Two usbmon traces (cat u0) are in the archive: One for plugging the > device in and one for starting 24bit 44100 4+2 mode and let it work for > some seconds. > > /sys/kernel/debug/usb/uhci/0000:00:1d.0 is included as well. It was > copied while the device was running in 24bit 44100 4+2 mode. Okay, this all makes sense. And it explains why endpoint 3 in interface 10 has such large maxpacket values; that endpoint evidently is a 4-channel input. The numbers work out correctly; the system has allocated 239 us/frame for the 2-channel output and 471 us/frame for the 4-channel input, giving a total usage of 710 us which is well under the 900-us maximum. Now let's go back to the non-working new machine. Try running two separate tests, the first doing just 4-channel input and the second doing just 2-channel output. That way both tests should work okay. During each test, save a copy of the "periodic" file from the ehci debugging directory. Let's see how they look, and we'll move forward from there. Alan Stern -- 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
