Date: Fri, 15 Apr 2011 09:38:02 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: Oliver Fromme <olli@lurza.secnetix.de> Cc: freebsd-multimedia@freebsd.org Subject: Re: USB microphone problems Message-ID: <201104150938.02429.hselasky@c2i.net> In-Reply-To: <201104141101.p3EB1JJ2023433@lurza.secnetix.de> References: <201104141101.p3EB1JJ2023433@lurza.secnetix.de>
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On Thursday 14 April 2011 13:01:19 Oliver Fromme wrote:
> Hans Petter Selasky <hselasky@c2i.net> wrote:
> > On Tuesday 12 April 2011 16:40:14 Oliver Fromme wrote:
> > > pcm5: chn_read(): pcm5:virtual:dsp5.vr0: record interrupt timeout,
> > >
> > > channel dead
> >
> > Try the following command on your device after it is plugged:
> >
> > usbconfig -d X.Y do_request 0x22 0x01 0x100 0x86 0x03 0x80 0xBB 0x00
> >
> > Does it help?
>
> I'm sorry for the late reply. I spent one or two hours
> plugging and unplugging that webcam a hundred times. :-)
>
> The good news: Yes, the command helps. But only when
> issued at a certain time.
>
> The following sequence works:
>
> 1. Plug camera in.
> 2. usbconfig -d 3.2 do_request 0x22 0x01 0x100 0x86 0x03 0x80 0xBB 0x00
> 3. usbconfig -d 3.2 reset
> 4. usbconfig -d 3.2 do_request 0x22 0x01 0x100 0x86 0x03 0x80 0xBB 0x00
> 5. Now the microphone works.
>
> I cannot omit any of the steps, and I cannot change the
> order of the steps. Otherwise the microphone does not work.
> Let me repeat: The do_request has to be done *twice*, and
> a reset has to be done in-between.
>
> Interestingly, the following works, too:
>
> 1. Plug camera in.
> 2. Run pwcview.
> 3. usbconfig -d 3.2 do_request 0x22 0x01 0x100 0x86 0x03 0x80 0xBB 0x00
> 4. Now the microphone works.
>
> No need to do a reset, and no need to perform the do_request
> twice. But again, it has to be done exactly in that order.
> It does not matter whether I stop pwcview or keep it running.
> The only important thing seems to be that pwcview opens the
> video device once. Instead of pwcview I can also use skype
> to open the video device (by starting the device test in the
> options dialog).
>
> The microphone keeps working, no matter what I do, until I
> unplug it.
>
> Just out of curiosity, what exactly does the do_request with
> those eight hex numbers do?
>
> Another thing I noticed is that mixer(8) still does not show
> a microphone device, only vol and pcm:
>
> Mixer vol is currently set to 75:75
> Mixer pcm is currently set to 75:75
>
> So I cannot change the mic level. Changing the vol and pcm
> values doesn't have any effect. But it's not fatal because
> the default mic level is acceptable.
>
> Thanks for your work!
>
> Best regards
> Oliver
=== uaudio.c
==================================================================
--- uaudio.c (revision 220305)
+++ uaudio.c (local)
@@ -1360,11 +1360,10 @@
sc->sc_mixer_iface_index);
/*
- * If just one sampling rate is supported,
- * no need to call "uaudio_set_speed()".
- * Roland SD-90 freezes by a SAMPLING_FREQ_CONTROL request.
+ * Only set the sample rate if the channel reports that it
+ * supports the frequency control.
*/
- if (ch->p_asf1d->bSamFreqType != 1) {
+ if (ch->p_sed->bmAttributes & UA_SED_FREQ_CONTROL) {
if (uaudio_set_speed(sc->sc_udev, endpoint, ch->sample_rate))
{
/*
* If the endpoint is adaptive setting the speed may
Could you try the patch above? /sys/dev/sound/usb/uaudio.c
--HPS
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