Hi, Clemens--
On Thu, Feb 23, 2017 at 5:47 AM, Clemens Ladisch <clemens@xxxxxxxxxx> 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
------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot
_______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
