Alsa and alsactl: init, store and default configuration of control file
Clash Royale CLAN TAG#URR8PPP
The target kernel is: 2.6.35.14 (old) and its running on an embedded platform and the codec is a wm8753.
I am trying to understand how the alsactl system works. I found a file asound.play @ etc/alsa and this is the configuration file the man pages refer to. I am not sure why mine is called asound.play instead of asound.state but running:
#alsactl init
#alsactl -f /etc/alsa/asound.play store
will default the asound.play file. With the customized version sound works but it doesn't with the default configuration. Here is an excerpt from the asound.play file for a default configuration and the custom configuration. Keep in mind this is just one control block of 85:
Default:
control.1
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 255'
comment.dbmin -12750
comment.dbmax 0
iface MIXER
name 'PCM Volume'
value.0 215
value.1 215
custom:
control.1
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 255'
iface MIXER
name 'PCM Volume'
value.0 250
value.1 250
It isn't obvious to me how the person who originally customized the file knew that she/he needed to get rid of comment.dbmin and dbmax. So how might one go about figuring out how they should be customizing this file so that sound works? Guess and check?
linux-kernel audio alsa
asked Dec 18 at 20:14
Rob
1065
add a comment |
The target kernel is: 2.6.35.14 (old) and its running on an embedded platform and the codec is a wm8753.
I am trying to understand how the alsactl system works. I found a file asound.play @ etc/alsa and this is the configuration file the man pages refer to. I am not sure why mine is called asound.play instead of asound.state but running:
#alsactl init
#alsactl -f /etc/alsa/asound.play store
will default the asound.play file. With the customized version sound works but it doesn't with the default configuration. Here is an excerpt from the asound.play file for a default configuration and the custom configuration. Keep in mind this is just one control block of 85:
Default:
control.1
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 255'
comment.dbmin -12750
comment.dbmax 0
iface MIXER
name 'PCM Volume'
value.0 215
value.1 215
custom:
control.1
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 255'
iface MIXER
name 'PCM Volume'
value.0 250
value.1 250
It isn't obvious to me how the person who originally customized the file knew that she/he needed to get rid of comment.dbmin and dbmax. So how might one go about figuring out how they should be customizing this file so that sound works? Guess and check?
linux-kernel audio alsa
asked Dec 18 at 20:14
Rob
1065
add a comment |
The target kernel is: 2.6.35.14 (old) and its running on an embedded platform and the codec is a wm8753.
I am trying to understand how the alsactl system works. I found a file asound.play @ etc/alsa and this is the configuration file the man pages refer to. I am not sure why mine is called asound.play instead of asound.state but running:
#alsactl init
#alsactl -f /etc/alsa/asound.play store
will default the asound.play file. With the customized version sound works but it doesn't with the default configuration. Here is an excerpt from the asound.play file for a default configuration and the custom configuration. Keep in mind this is just one control block of 85:
Default:
control.1
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 255'
comment.dbmin -12750
comment.dbmax 0
iface MIXER
name 'PCM Volume'
value.0 215
value.1 215
custom:
control.1
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 255'
iface MIXER
name 'PCM Volume'
value.0 250
value.1 250
It isn't obvious to me how the person who originally customized the file knew that she/he needed to get rid of comment.dbmin and dbmax. So how might one go about figuring out how they should be customizing this file so that sound works? Guess and check?
linux-kernel audio alsa
asked Dec 18 at 20:14
Rob
1065
The target kernel is: 2.6.35.14 (old) and its running on an embedded platform and the codec is a wm8753.
I am trying to understand how the alsactl system works. I found a file asound.play @ etc/alsa and this is the configuration file the man pages refer to. I am not sure why mine is called asound.play instead of asound.state but running:
#alsactl init
#alsactl -f /etc/alsa/asound.play store
will default the asound.play file. With the customized version sound works but it doesn't with the default configuration. Here is an excerpt from the asound.play file for a default configuration and the custom configuration. Keep in mind this is just one control block of 85:
Default:
control.1
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 255'
comment.dbmin -12750
comment.dbmax 0
iface MIXER
name 'PCM Volume'
value.0 215
value.1 215
custom:
control.1
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 255'
iface MIXER
name 'PCM Volume'
value.0 250
value.1 250
It isn't obvious to me how the person who originally customized the file knew that she/he needed to get rid of comment.dbmin and dbmax. So how might one go about figuring out how they should be customizing this file so that sound works? Guess and check?
linux-kernel audio alsa
linux-kernel audio alsa
asked Dec 18 at 20:14
Rob
1065
asked Dec 18 at 20:14
Rob
1065
edited Dec 18 at 21:01
asked Dec 18 at 20:14
Rob
1065
asked Dec 18 at 20:14
Rob
1065
asked Dec 18 at 20:14
Rob
1065
1065
add a comment |
add a comment |
1 Answer
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I'd guess that the dbmin/dbmax comments are missing because that file was generated with an older version of the driver that did not yet have dB information.
Anyway, comments are ignored by alsactl restore, so this does not matter.
The iface and name entries identify a mixer control; the value values specify the value(s) of that control.
To get the sound to work, you have to know how these mixer controls affect the hardware. Obviously, whoever created those customized settings did know.
answered Dec 18 at 21:36
CL.
2,116913
So anything that says comment.(stuff) is insignificant? All I need to worry about is: iface, name, value.0 and value.1? Do you know off hand if there is somewhere I can go to learn how these mixer controls effect the hardware?
– Rob
Dec 18 at 21:46
Yes. Yes. That would be the documentation of your embedded platform.
– CL.
Dec 18 at 21:55
add a comment |
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1 Answer
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active
oldest
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votes
I'd guess that the dbmin/dbmax comments are missing because that file was generated with an older version of the driver that did not yet have dB information.
Anyway, comments are ignored by alsactl restore, so this does not matter.
The iface and name entries identify a mixer control; the value values specify the value(s) of that control.
To get the sound to work, you have to know how these mixer controls affect the hardware. Obviously, whoever created those customized settings did know.
answered Dec 18 at 21:36
CL.
2,116913
So anything that says comment.(stuff) is insignificant? All I need to worry about is: iface, name, value.0 and value.1? Do you know off hand if there is somewhere I can go to learn how these mixer controls effect the hardware?
– Rob
Dec 18 at 21:46
Yes. Yes. That would be the documentation of your embedded platform.
– CL.
Dec 18 at 21:55
add a comment |
I'd guess that the dbmin/dbmax comments are missing because that file was generated with an older version of the driver that did not yet have dB information.
Anyway, comments are ignored by alsactl restore, so this does not matter.
The iface and name entries identify a mixer control; the value values specify the value(s) of that control.
To get the sound to work, you have to know how these mixer controls affect the hardware. Obviously, whoever created those customized settings did know.
answered Dec 18 at 21:36
CL.
2,116913
So anything that says comment.(stuff) is insignificant? All I need to worry about is: iface, name, value.0 and value.1? Do you know off hand if there is somewhere I can go to learn how these mixer controls effect the hardware?
– Rob
Dec 18 at 21:46
Yes. Yes. That would be the documentation of your embedded platform.
– CL.
Dec 18 at 21:55
add a comment |
I'd guess that the dbmin/dbmax comments are missing because that file was generated with an older version of the driver that did not yet have dB information.
Anyway, comments are ignored by alsactl restore, so this does not matter.
The iface and name entries identify a mixer control; the value values specify the value(s) of that control.
To get the sound to work, you have to know how these mixer controls affect the hardware. Obviously, whoever created those customized settings did know.
answered Dec 18 at 21:36
CL.
2,116913
I'd guess that the dbmin/dbmax comments are missing because that file was generated with an older version of the driver that did not yet have dB information.
Anyway, comments are ignored by alsactl restore, so this does not matter.
The iface and name entries identify a mixer control; the value values specify the value(s) of that control.
To get the sound to work, you have to know how these mixer controls affect the hardware. Obviously, whoever created those customized settings did know.
answered Dec 18 at 21:36
CL.
2,116913
answered Dec 18 at 21:36
CL.
2,116913
answered Dec 18 at 21:36
CL.
2,116913
answered Dec 18 at 21:36
CL.
2,116913
2,116913
So anything that says comment.(stuff) is insignificant? All I need to worry about is: iface, name, value.0 and value.1? Do you know off hand if there is somewhere I can go to learn how these mixer controls effect the hardware?
– Rob
Dec 18 at 21:46
Yes. Yes. That would be the documentation of your embedded platform.
– CL.
Dec 18 at 21:55
add a comment |
So anything that says comment.(stuff) is insignificant? All I need to worry about is: iface, name, value.0 and value.1? Do you know off hand if there is somewhere I can go to learn how these mixer controls effect the hardware?
– Rob
Dec 18 at 21:46
Yes. Yes. That would be the documentation of your embedded platform.
– CL.
Dec 18 at 21:55
So anything that says comment.(stuff) is insignificant? All I need to worry about is: iface, name, value.0 and value.1? Do you know off hand if there is somewhere I can go to learn how these mixer controls effect the hardware?
– Rob
Dec 18 at 21:46
So anything that says comment.(stuff) is insignificant? All I need to worry about is: iface, name, value.0 and value.1? Do you know off hand if there is somewhere I can go to learn how these mixer controls effect the hardware?
– Rob
Dec 18 at 21:46
Yes. Yes. That would be the documentation of your embedded platform.
– CL.
Dec 18 at 21:55
Yes. Yes. That would be the documentation of your embedded platform.
– CL.
Dec 18 at 21:55
add a comment |
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