While testing alsa-lib I found that the attached patch - which comes 
from Debian - probably should be applied upstream as well.

On 2014-06-13 12:08, Jaroslav Kysela wrote:
> Hello all,
>
>    ALSA 1.0.28 packages are available for testing at
>
> ftp://ftp.alsa-project.org/pub/testing/
>
>    Please, report any issues. I expect to announce the release on Monday.
>
> 					Jaroslav
>
> -----
> Jaroslav Kysela <perex@perex.cz>
> Linux Kernel Sound Maintainer
> ALSA Project; Red Hat, Inc.
>

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic