Re: [gentoo-user] Still haveing problems with audio and guvcview

[meino.cramer@gmx.de]

Mick <michaelkintzios@gmail.com> [11-06-05 14:40]:
> On Sunday 05 Jun 2011 04:51:54 meino.cramer@gmx.de wrote:
> 
> > Hi Mick,
> > 
> > I did a
> > 
> >     modinfo snd_usb_audio
> > 
> > and git this:
> > 
> >     filename:       /lib/modules/2.6.39.1/kernel/sound/usb/snd-usb-audio.ko
> >     license:        GPL
> >     description:    USB Audio
> >     author:         Takashi Iwai <tiwai@suse.de>
> >     alias:          usb:v*p*d*dc*dsc*dp*ic01isc01ip*
> >     alias:          usb:v*p*d*dc*dsc*dp*ic01isc03ip*
> >     alias:          usb:v0DBAp1000d*dc*dsc*dp*ic*isc*ip*
> [snip ...]
> 
> >     depends:        snd-usbmidi-lib,snd-pcm,snd,snd-hwdep
> >     vermagic:       2.6.39.1 SMP preempt mod_unload
> >     parm:           index:Index value for the USB audio adapter. (array of
> > int) parm:           id:ID string for the USB audio adapter. (array of
> > charp) parm:           enable:Enable USB audio adapter. (array of bool)
> > parm:           vid:Vendor ID for the USB audio device. (array of int)
> > parm:           pid:Product ID for the USB audio device. (array of int)
> > parm:           nrpacks:Max. number of packets per URB. (int)
> >     parm:           async_unlink:Use async unlink mode. (bool)
> >     parm:           device_setup:Specific device setup (if needed). (array
> > of int) parm:           ignore_ctl_error:Ignore errors from USB controller
> > for mixer interfaces. (bool)
> > 
> > I am unsure how to play with the params...
> > 
> > For example: Is "snd_usb_audio enable=treu" correct?
> 
> Well, "treu" wouldn't be correct, not even in French!  ;-)
> 
> 
> > Why it is an /array/ of bool?
> 
> I think that this is used when there is more than one device/interface/etc. 
> where you will need to enable/disable each one.
> 
> 
> > May be a last chance is with fiddling with this params? Can I
> > rmmod/insmod snd_usb_audio while giving new params to it? How
> > can I do that? Fortunately
> > 
> >     Module                  Size  Used by
> >     ecryptfs               87672  3
> >     snd_seq_dummy           1359  0
> >     snd_seq_oss            30300  0
> >     snd_seq_midi_event      5268  1 snd_seq_oss
> >     snd_seq                50559  5
> > snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_pcm_oss            43683 
> > 0
> >     snd_mixer_oss          14787  1 snd_pcm_oss
> >     microcode               6787  0
> >     nvidia              10489149  28
> >     snd_hda_codec_via      51530  1
> > *** snd_usb_audio          90398  0
> >     snd_hda_intel          20832  0
> >     snd_hda_codec          63752  2 snd_hda_codec_via,snd_hda_intel
> >     snd_pcm                73953  4
> > snd_pcm_oss,snd_usb_audio,snd_hda_intel,snd_hda_codec mt352               
> >    5653  1
> >     snd_hwdep               5940  2 snd_usb_audio,snd_hda_codec
> >     8250_pci               23504  0
> >     snd_timer              18685  2 snd_seq,snd_pcm
> >     snd_usbmidi_lib        18214  1 snd_usb_audio
> >     snd_rawmidi            18484  1 snd_usbmidi_lib
> >     snd_seq_device          5197  4
> > snd_seq_dummy,snd_seq_oss,snd_seq,snd_rawmidi dvb_bt8xx              11873
> >  0
> >     bt878                   7643  1 dvb_bt8xx
> >     bttv                  112236  2 dvb_bt8xx,bt878
> >     snd                    55623  15
> > snd_seq_dummy,snd_seq_oss,snd_seq,snd_pcm_oss,snd_mixer_oss,snd_hda_codec_
> > via,snd_usb_audio,snd_hda_intel,snd_hda_codec,snd_pcm,snd_hwdep,snd_timer,s
> > nd_usbmidi_lib,snd_rawmidi,snd_seq_device gspca_ov534            10121  0
> >     gspca_main             22449  1 gspca_ov534
> >     i2c_algo_bit            4928  1 bttv
> >     videobuf_dma_sg         7344  1 bttv
> >     videobuf_core          15263  2 bttv,videobuf_dma_sg
> >     btcx_risc               3171  1 bttv
> >     8250                   21264  1 8250_pci
> >     serial_core            18115  1 8250
> >     pcspkr                  1811  0
> >     asus_atk0110            8206  0
> >     tveeprom               13257  1 bttv
> >     k10temp                 2715  0
> >     snd_page_alloc          6793  2 snd_hda_intel,snd_pcm
> > 
> > snd_usb_audio is not used by anything else...
> > 
> > Years over years I had not a single problem with alsa and modules at
> > all and this seems now be th revenge of the peace of all that years...
> 
> Yes, I would definitely try switching some of these parameters on/off to see 
> if it will make a difference.
> 
> I recommend you use modprobe -v instead of insmod.  So this could be:
> 
> modprobe -v -r snd_usb_audio
> modprobe -v -n snd_usb_audio enable=yes
> 
> If you don't get any horror warnings when you run it, then remove the "-n" 
> option and run it again.  Also, try paremeter ignore_ctl_error=1 in case it 
> makes a difference.
> 
> To make this permanent add a line in /etc/modprobe.d/alsa-base.conf
> 
> options snd_usb_audio enable=yes
> options snd_usb_audio ignore_ctl_error=1
> 
> and restart alsa (or reboot).
> 
> However, the new openrc uses a new way to start modules and dictate their 
> configuration.  So the above may not work for ever and you would need to add 
> at some point the module and its parameters in /etc/conf.d/modules.  For now I 
> though I would leave it in /etc/modprobe.d/alsa-base.conf
> 
> Hope this helps.
> -- 
> Regards,
> Mick


Hi Mick, 

this is becoming interesting beyond the goal of solving the problem as
such more and more ;)

Is there a way to get the default settings of the listed parameters
above when the module is loading without giving any additional params
on the command line?

If yes, I could exclude that default setting from the list of possible
working setups and additionally -- may be -- I get a hint, what to
twiddle first....

Best regards,
mcc