Bastien Nocera wrote: > On Wed, 2016-10-12 at 14:43 +0200, Clemens Ladisch wrote: >> Bastien Nocera wrote: >>> " >>> A change of state in the audio function is most often caused by a >>> certain event that takes place. An event can either be user- >>> initiated >>> or device-initiated. User-initiated jack insertion or removal is a >>> typical example of a user-initiated event. >>> " >> >> There are not many USB Audio 2.0 devices, and I'm not aware of any >> that actually implements this. > > I guess I would see whether there are events if I captured the USB > traffic even without special handling/turning on a feature in the > drivers, right? Most devices do not even have the status endpoint (see "lsusb -v"). To check what events arrive, you can add logging to the snd_usb_mixer_interrupt() function. Regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
