[alsa-devel] External sound card issue

[Ionica Bizau]

When I run the first command:

$ rmmod snd-usb-audio
rmmod: ERROR: Module snd_usb_audio is in use






On Monday, January 27, 2014 10:57 AM, Takashi Iwai <tiwai at suse.de> wrote:
 
At Sun, 26 Jan 2014 11:45:45 -0800 (PST),
Ionica Bizau wrote:
> 
> I will try them. Is this a bug in the hardware device or in the Linux driver?

It's a hardware bug.

> If this is in the Linux driver, can this be fixed?

We have tons of workarounds in the driver for such broken devices.
This will be just yet another one.


Takashi


> 
> Cheers
> 
> 
> 
> On Sunday, January 26, 2014 8:01 PM, Clemens Ladisch <clemens at ladisch.de> wrote:
>  
> Ionica Bizau wrote:
> > $ amixer -c1 cget name='PCM Capture Source'
> > numid=7,iface=MIXER,name='PCM Capture Source'
> >   ; type=ENUMERATED,access=rw------,values=1,items=2
> >   ; Item #0 'Unit 22'
> >   ; Item #1 'Unit 22'
> > amixer: Control hw:1 element read error: Broken pipe
> 
> The device's firmware does not allow reading this mixer control for some
> reason; this is probably a bug.
> 
> Please try the following commands:
>   rmmod snd-usb-audio
>   modprobe snd-usb-audio ignore_ctl_error=1
> 
> This makes the driver ignore errors, but cannot prevent the errors from
> happening in the first place.  Please check if you get the desired
> effect when you write this control.
> 
> 
> Regards,
> 
> Clemens
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>