On Thu, 17 Aug 2017, Steven Timms wrote: > I've just re-done them just in case it was wrong the first time. I wasn't > sure if 'control' was fresh data as the clear command didn't seem to do > anything. Plus the file size seems the same even on the second attempt (I'm > not knowledgeable enough to know if this is correct) > > Hope all is good, thx again > > On Thu, Aug 17, 2017 at 6:33 PM, Steven Timms <steven.p.timms@xxxxxxxxx> > wrote: > > > Thanks Alan, > > > > I hope I've done this correctly. The control file got pretty large even > > though it was a few seconds. I guess the device you're concerned about is either the C-1U made by BEHRINGER or else the Audiolab M-DAC made by Lakewest Audio, since those are the only USB audio devices in your listings. The thing is, both of those devices are attached to bus 3, which is connected to an xHCI controller. Buses 1 and 2, by contrast, are connected to EHCI controllers. This means that no matter what changes you make to the ehci-hcd driver, it won't have any effect at all on how your audio devices behave. It should be easy enough to verify this -- just boot into an unpatched kernel, leaving everything else the same, and see what happens when you use the audio devices. The situation would be different if you plugged the DAC into a USB-2 port instead of a USB-3 port. If you do try this, and you run the tests again, note that you did not follow my instructions for the second test correctly. In that test, I asked you to post the output from the "dmesg" command, not the contents of /sys/kernel/debug/dynamic_debug/control. 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
