[alsa-devel] Reset to clean state after snd_ctl_add_integer_elem_set ?
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/alsactlto 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 ?
Thank you
Fulup
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
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 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
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Fulup Ar Foll