On Thu, 3 Nov 2011, Anton Alekseev wrote: > > You didn't get the "force halt; handshake..." message. It looks like > > the periodic schedule can take as long as 8 ms to stop running! > > > > Error -27 is -EFBIG, which means the driver tried to submit too much > > data for ehci-hcd to handle. > > You mean that ALSA driver snd_usb_audio can be a problem? Maybe. Your log seemed to indicate that, but I haven't heard of any similar problems before. > Two days ago I made an experiment: > - installed realtime kernel 2.6.31-11-rt > -disabled EHCI in BIOS for my usb host controller > - installed proprietary nvidia driver (cause I didn't want to update > nouveau for old kernel and that old nouveau started only with low > resolution) > - run jackd with parameters frequency=48000Hz, buffer_size=64 > samples,buffers_count=2 > > and in USB 1.1 OHCI mode my ATI controller worked without any bugs. > So I think that snd_usb_audio ALSA driver work correctly. > Am I right? You showed that it works right when using the OHCI controller. That doesn't mean it works right all the time. > Please, tell me what should I do next to get my EHCI working? Here's the next thing to try: Boot a kernel that was built with CONFIG_USB_DEBUG enabled, and then mount a debugfs on /sys/kernel/debug. While running the audio program, go into the /sys/kernel/debug/usb/ehci/0000:00:12.2 directory and make a copy of the files there (the only ones that really matter are the "registers" and "periodic" files). Also, get a copy of the /sys/kernel/debug/usb/devices file. Let's see what all those files have to say. 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
