[alsa-devel] Reset to clean state after snd_ctl_add_integer_elem_set ?

[Fulup Ar Foll]

Clement,

This is more or less what I have todo today. Nevertheless I do not 
understand how "alsactl init" which says in help "initialize driver to a 
default state" does not do the job.

Fulup

On 18/07/17 13:03, Clemens Ladisch wrote:
> Fulup Ar Foll wrote:
>> I'm using snd_ctl_add_boolean_elem_set and snd_ctl_add_integer_elem_set
>> to create some user kernel controls. While the operation work find I
>> did not find any simple command to erase all those controls.
>>
>> Even "/usr/sbin/alsactl --init" does not remove those added controls.
>> The only way I find is to prevent  /usr/sbin/alsactl to happen during
>> reboot to really reset the ALSA driver to an initial state, which is
>> really not pratical when developing/debugging.
>>
>> Question: is there a simple method to return to a clean and fresh state
>> after snd_ctl_add_xxxx without rebooting the machine ?
>
> There is no ownership information for user controls, so "alsactl store"
> and "alsactl restore" always keep them.
>
> To remove them, you can write a tool to call snd_ctl_elem_remove() on
> all of them.  Alternatively, unload the driver module, and remove the
> entries from the saved state file (probably /var/lib/alsa/asound.state).
>
>
> Regards,
> Clemens
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