pl bossart napsal(a):
> If I play my AC3 data on my HDAudio/SPDIF output using the hw:0,1
> device, I can use alsamixer/amixer to mute/unmute.
>
> [ume@plb PassThough]$ amixer cset numid=12 on
> numid=12,iface=MIXER,name='IEC958 Playback Switch'
> ; type=BOOLEAN,access=rw------,values=1
> : values=on
> [ume@plb PassThough]$ amixer cset numid=12 off
> numid=12,iface=MIXER,name='IEC958 Playback Switch'
> ; type=BOOLEAN,access=rw------,values=1
> : values=off
>
> Now if I use the iec958: plugin, I can't control the mute switch any longer:
> [ume@plb PassThough]$ amixer cset numid=12 off
> amixer: Control default element write error: Operation not permitted
>
> [ume@plb PassThough]$ amixer cset numid=12 on
> amixer: Control default element write error: Operation not permitted
>
> What could possibly cause this issue? the IEC plugin relies on the
> device 1, am I missing something here?
> Thanks for your help
> - Pierre
Hi Pierre,
Check the config files in /usr/share/alsa/cards, probably HDA-Intel.conf
in your case, specifically the hooks section of its iec958 device
definition. It reads:
hooks.0 {
type ctl_elems
hook_args [
{
name "IEC958 Playback Default"
lock true
preserve true
value [ $AES0 $AES1 $AES2 $AES3 ]
}
{
name "IEC958 Playback Switch"
lock true
preserve true
value true
}
]
}
You can play with the "lock" directive.
Best regards,
Pavel.
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