Dear ALSA,
I'm not really having a great deal of luck getting responses from ALSA
developers here, but I figured I'd try again just for the sake of
documenting the various bugs that I've been running into. I guess most
people have moved to Pulseaudio and that is why ALSA development has
petered out? Which is a bit sad because it seems like ALSA has a lot
of potential.
Anyway I have a setup which combines various cards and usually it
works fine, but sometimes when I restart I find that one or both of
the softvol controls I set up fails to work, in other words I cannot
change the value in 'alsamixer', and when I use 'amixer' to change it
then I get "Invalid command!". Any ideas how I can make the control be
responsive again?
$ amixer -Dmusic controls
...
numid=12,iface=MIXER,name='Music'
...
numid=11,iface=MIXER,name='Noise'
...
$ amixer -Dmusic set Noise '5%-'
Simple mixer control 'Noise',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 255
Front Left: 203 [80%]
Front Right: 203 [80%]
$ amixer -Dmusic set Music '5%-'
amixer: Invalid command!
$ cat .asoundrc
...
pcm.noise {
type softvol
slave.pcm "plug:multi_mix"
control {
name "Noise"
card 3
}
}
ctl.noise {
type hw
card 3
}
pcm.music {
type softvol
slave.pcm "plug:upmix"
control {
name "Music"
card 3
}
}
ctl.music {
type hw
card 3
}
I'm attaching other files which define "upmix" and "multi_mix" in my
setup. As I said I think the problem re-occurs randomly when I reboot,
so I'm not sure how relevant these attachments are.
In fact I just rebooted and found the control working. But it would be
nice if I could fix this without rebooting. Also, now with the same
(previously working, just very loud) setup I get an "unknown field
channels" error when I try to play to 'music', while playing to
'noise' works fine... which is strange because "channels" only occurs
in a PCM device used by both 'music' and 'noise'... I'm not sure how
else I can try to narrow this down, without line numbers.
Thank you,
Frederick
P.S. It would also be nice if softvol controls did not have to be
associated with a physical card, but I guess that is more of a feature
request than a bug...
pcm.mix1 {
type dmix
ipc_key 941656
slave {
pcm "hw:3"
</home/frederik/.myalsa/hw-settings.alsa>
}
}
pcm.mix2 {
type dmix
ipc_key 297752
slave {
pcm "hw:4"
</home/frederik/.myalsa/hw-settings.alsa>
}
}
pcm.multi_mix {
type multi;
slaves.a.pcm "mix1"
slaves.a.channels 2
slaves.b.pcm "mix2"
slaves.b.channels 2
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
}
pcm.upmix {
type route;
slave.pcm "multi_mix";
ttable.0.0 1;
ttable.1.1 1;
ttable.0.2 1;
ttable.1.3 1;
}
rate 44100
format S16_LE
period_time 0
period_size 2048
buffer_size 65536
buffer_time 0
periods 128
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