Alan Stern wrote: > On Thu, 4 Jul 2013, Ming Lei wrote: >>> Changing the altsetting is another way to tell the HCD that a stream is >>> starting fresh. >> >> Yes, it might work, but many details need to be payed attention to, such >> as, changing altsetting may not be done during suspend/resume. > > Hmmm. I don't know how snd-usb-audio handles a suspend/resume in the > middle of playback or recording. In this case, the ALSA framework will stop the PCM stream, and on resume, report this like an underrun; the application will then reinitialize the stream. (Handling suspend/resume transparently would require that the driver can restart playing from an arbitrary position in the ring buffer; snd-usb-audio does not bother to implement this.) 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
