Re: USB sound card device complains about "error -28: not enough bandwidth" only on specific PC hardware, seems not kernel specific

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On Sun, 26 Aug 2012, David Ranch wrote:

> > By the way, now that you've got CONFIG_USB_DEBUG enabled, there's 
> > something I'd like to see. I'm assuming you've got a debugfs 
> > filesystem mounted on /sys/kernel/debug. Go into 
> > /sys/kernel/debug/usb/ehci/0000:00:1d.0/ (that's the directory 
> > corresponding to the controller your device is plugged into, bus 2) 
> > and post a copy of the "periodic" file in that directory

...

> If you can help me figure out why the EHCI debug interface isn't showing 
> up (maybe the /proc line is a hint), I'll recompile and get the results 
> you asked for.

Were you able to make any progress on this?

Alan Stern

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