[alsa-devel] [PATCH] ALSA: usb-audio: Add quirk for Focusrite Scarlett 18i6

Clemens Ladisch clemens at ladisch.de
Sat Dec 29 13:38:39 CET 2012

Grant Diffey wrote:
>Last week on #alsa  I found yet another person who's having
>problems with snd-usb-audio not supporting UAC2 Feature units.

This is an extension unit. The driver not handling it is yet another bug.

>Worse still the relevant part of the descriptor is incomplete according to

lsusb might be as error-free as snd-usb-audio, and in any case an
incomplete descriptor for some random mixer control should be no
reason to refuse working with the device altogether.

>So while we could submit another quirk for this to ignore the mixer for
>now. and this would probably make the device "work"  without access to
>the feature unit is it sensible?

The sensible thing to do is to review the entire new descriptor parsing
code to remove all invalid and overzealous error cases.


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