On Sun, 30 Sep 2012, Lassi [ISO-8859-1] V��inen wrote: > I just quickly tried with Ubuntu Studio 11.04, kernel version 2.6.38 > (generic). Seems that the Ardour playback performance was better, or at least > the crashing is not that frequent as with the 3.2 .. 3.6-rc7 kernels. However, > towards the end of my test sequnece, when closing down Ardour and stopping > Jack, I noticed the "timeout: active URBs" message in dmesg log. So I'll try > and check this issue when I have more time. That message results from the "lost" URBs we saw in the usbmon trace. It's a good indication that something is very wrong -- probably a better indication than the -22 errors > > If there is a software workaround for this OHCI problem, I'd like to > > know about it. At the moment I can't think of any good approach. > > > > Yeah, I also wonder whether the Ubuntu Studio Jack buffering and system memory > settings might have some effect on this, not the actual driver changes? The ideal check would be to run Ubuntu 12 but boot with the 2.6.38 kernel. Or vice versa: run Ubuntu 11 but boot with the 3.6 kernel. To be honest, I could write a fairly simple change to the driver that would work around this hardware bug most of the time. But it wouldn't be perfect; occasionally the problem would still show up. Would you like to test such a change? 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
