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    SubjectRe: [alsa-devel] [PATCH] Jabra SPEAK 410 USB - no audio playback
    On Fri, Dec 16, 2011 at 02:49:05PM +0100, Clemens Ladisch wrote:
    > Richard W.M. Jones wrote:
    > > The attached patch fixes USB audio support for the Jabra SPEAK 410 USB.
    > >
    > > The problem, as I understand it, is that the device contains a
    > > Class-Specific Endpoint (CS_ENDPOINT) descriptor before the Endpoint
    > > (ENDPOINT) descriptor. The USB code all assumes that CS_ENDPOINT can
    > > only appear after ENDPOINT. Therefore the USB code divides up the
    > > interface descriptor into "stuff before ENDPOINT" (in
    > > interface->extra) and "stuff after ENDPOINT" (in
    > > interface->endpoint[0]->extra). For this device, this division does
    > > not work.
    > >
    > > The solution (which is a hack ...) is to also search interface->extra
    > > looking for the missing descriptor.
    >
    > The patch looks good. Please run it through checkpatch.pl and provice
    > a Signed-off-by tag (see Documentation/SubmittingPatches).

    Sorry, I should have followed up on this list ...

    Tom (in the CC line) opened a bug with Jabra, and they have issued a
    firmware update. Unfortunately this update requires some Windows
    software to run. I applied this, and it does appear to fix the audio
    playback problem, though curiously it doesn't completely fix the
    ENDPOINT/CS_ENDPOINT problem, so who knows what's really going on
    there.

    Anyway, should you want the update it is here:

    https://bugzilla.redhat.com/show_bug.cgi?id=766714#c1

    Thanks Tom!

    Rich.

    --
    Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
    virt-df lists disk usage of guests without needing to install any
    software inside the virtual machine. Supports Linux and Windows.
    http://et.redhat.com/~rjones/virt-df/


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