I tested the hotplug ãrecord and catch the picture, this interface reset doesn't cause any problem. In snd_usb_endpoint_configure, It set false to interface to deselect altsetting at first. But , if skip the interface clear (ex. ep->cur_rate = 0;), there is no sound output. ---- 主ãé¢ï¼Re: åå¤: Re: åå¤: Re: [PATCH] ALSA: usb-audio: fix Hamedal C20 usb camero disconnect issue æ¥ãæï¼2022-11-07 16:15 å件人ï¼Takashi Iwai æ¶ä»¶äººï¼è¾è¶ On Mon, 07 Nov 2022 02:33:57 +0100, è¾è¶ wrote: > > Yes, the audio device is a UAC1 device, and it used set_sample_rate_v1 to > set sample. > > So, I add a quirk to keep up the USB interface up even if the audio stream > is closed. Well, my question is also about the parameter changes. This interface reset doesn't cause any problem? Or we should skip the interface clear there, too? Takashi > > ---- > > 主ãé¢ï¼Re: åå¤: Re: [PATCH] ALSA: usb-audio: fix Hamedal C20 usb camero > disconnect issue > æ¥ãæï¼2022-11-04 17:59 > å件人ï¼Takashi Iwai > æ¶ä»¶äººï¼è¾è¶ > > On Fri, 04 Nov 2022 10:50:48 +0100, > è¾è¶ wrote: > > > > I 'm sorry, I don't know whether you receiver my mail for 'lsusb -v' to > > Hamedal C20 > > I received your previous mails including lsusb -v output. But the > post was filtered out by some reason? > > So the audio device looks like a UAC1 device. And this one requires > to keep up the USB interface up even if the audio stream is closed > (not about the parameter changes)? > > Takashi > >
