linux-kernel - Re: Bug in Linux USB stack

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Date:	Mon, 14 Sep 2015 10:50:27 +0300
From:	Mathias Nyman <mathias.nyman@...el.com>
To:	Andrew Gillis <andrew@...texbox.org>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Bug in Linux USB stack

On 12.09.2015 00:56, Andrew Gillis wrote:
> I get an error when trying to play music through USB DACs under Linux. This
> only happens with a few high end DACs and only when using a NEC uPD72020x
> chipset USB 3.0 port.
>
> The people at RedHat think it may be the NEC uPD72020x chipset is reporting
> it's capabilities incorrectly.
>
> I'm not sure why some only some DACs are effected. it may depend on their
> chipsets.
>
> There is a detailed description of the bug with traces here
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1240798
>
> Any idea what I can do to fix this?
>

Can you re-send the logs. Both dmesg with xhci debugging enabled and lsusb -v.
Clicking the links to the logs in redhat bugzilla justs says
"The paste you are looking for does not exist"

The command completion code 0x11 (17 dec) is a parameter error, indicating that xhci thinks
that some value we used in the input context is wrong.

-Mathias
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