Hi, Clemens--
On Thu, Feb 23, 2017 at 5:47 AM, Clemens Ladisch <clem...@ladisch.de> wrote:
> Caelia Chapin wrote:
> > On Thu, Feb 23, 2017 at 5:14 AM, Clemens Ladisch wrote:
> > This might be a bug in the firmware of your device (I guess the
> driver
> > shipped with it does not bother to ask for the clock source status,
> and so
> > this function was never tested).
> >
> > Do you know how to recompile your kernel?
> >
> > Yes, I've done it many times - though it has been a few years. What
> specific customizations would you suggest?
>
> In sound/usb/clock.c, around line 192, try to remove this:
>
> if (validate && !uac_clock_source_is_valid(chip,
> entity_id)) {
> usb_audio_err(chip,
> "clock source %d is not valid, cannot
> use\n",
> entity_id);
> return -ENXIO;
> }
>
Yes, that did the trick! Thank you very much for your assistance.
I do have a couple of quick follow-up questions:
1) I presume the code I removed exists for a reason. Are there likely to be
any adverse side effects from this kernel modification?
2) I would like to contact Denon about this issue. I think it should not be
necessary to hack the kernel in order to get this sound card working; from
what you have said it seems like this is a problem the manufacturer should
fix. Whether they will or not is another question, since this is evidently
not a problem for Windows or Mac users (I mean, it's an expensive piece of
pro audio gear, and I think it is inconceivable that a problem like this
could exist on those platforms without people complaining loudly). But if
it's a matter of standards compliance and doesn't take a huge amount of
work to fix, maybe? Can you state definitively that failing to respond to
the clock source query is incorrect behavior?
Best regards,
Caelia
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