Wrong creation of emulated volume control.

Wrong creation of emulated volume control.

[Petr Gladkikh]

Hello.

I did not managed to find anything appropriate in the list and seems 
this problem hasn't been reported yet.

I have sound card with PCM having only mute switch (no volume 
control). I have installed alsa-lib-1.8.0 (release). My control list 
now have following PCM control (following is part of amixer output):

 >>>
Simple mixer control 'PCM',0
   Capabilities: pvolume pswitch pswitch-joined
   Playback channels: Front Left - Front Right - Front Center - Rear 
Left - Rear Right - Woofer - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? 
- ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
   Limits: Playback 0 - 0
   Front Left: Playback 0 [0%] [on]
   Front Right: Playback 0 [0%] [on]
   Front Center: Playback 0 [0%] [on]
   Rear Left: Playback 0 [0%] [on]
   Rear Right: Playback 0 [0%] [on]
   Woofer: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
   ?: Playback 0 [0%] [on]
<<<

This incorrect registration of new control seems also the reason of 
crashes and messed display in alsamixer. I had not time to track the 
reason of this but maybe there is some one who can fix it with less 
effort than me.

Probably this needs some kind of simple registry in the filesystem so 
all alsa-lib applications can share information about new (software 
emulated) control.

--
Petr.


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Re: Wrong creation of emulated volume control.

[Clemens Ladisch]

Petr Gladkikh wrote:
> I have sound card with PCM having only mute switch (no volume
> control). I have installed alsa-lib-1.8.0 (release). My control list
> now have following PCM control (following is part of amixer output):
>
>  >>>
> Simple mixer control 'PCM',0
>    Capabilities: pvolume pswitch pswitch-joined
>    Playback channels: Front Left - Front Right - Front Center - Rear
> Left - Rear Right - Woofer - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
> - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
>    Limits: Playback 0 - 0
>    Front Left: Playback 0 [0%] [on]
>    Front Right: Playback 0 [0%] [on]
>    Front Center: Playback 0 [0%] [on]
>    Rear Left: Playback 0 [0%] [on]
>    Rear Right: Playback 0 [0%] [on]
>    Woofer: Playback 0 [0%] [on]
>    ?: Playback 0 [0%] [on]
>    ?: Playback 0 [0%] [on]
>    ?: Playback 0 [0%] [on]
>    ...

How do these controls look in /etc/asound.state after running "alsactl
store"?


Clemens



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Re2: Wrong creation of emulated volume control.

[Petr Gladkikh]

Hello.

Clemens Ladisch wrote:
>>> I have sound card with PCM having only mute switch (no volume
>>> control). I have installed alsa-lib-1.8.0 (release). My control list
>>> now have following PCM control (following is part of amixer output):
>>>
>>>  >>>
>>> Simple mixer control 'PCM',0
>>>    Capabilities: pvolume pswitch pswitch-joined
>>>    Playback channels: Front Left - Front Right - Front Center - Rear
>>> Left - Rear Right - Woofer - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
>>> - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ? - ?
>>>    Limits: Playback 0 - 0
>>>    Front Left: Playback 0 [0%] [on]
>>>    Front Right: Playback 0 [0%] [on]
>>>    Front Center: Playback 0 [0%] [on]
>>>    Rear Left: Playback 0 [0%] [on]
>>>    Rear Right: Playback 0 [0%] [on]
>>>    Woofer: Playback 0 [0%] [on]
>>>    ?: Playback 0 [0%] [on]
>>>    ?: Playback 0 [0%] [on]
>>>    ?: Playback 0 [0%] [on]
>>>    ...
> 
> 
> How do these controls look in /etc/asound.state after running "alsactl
> store"?

It's my fault but the subject is not correct, I did not mentioned that 
I had not configured any plugins yet (including svol). But the problem 
exists anyway.

My environment (if it helps)
Linux 2.6.9 (Gentoo)
alsa-lib 1.0.8, alsa-utils 1.0.8 (release)
Hardware: AC97 in ICH5 chipset, 6-channel C-Media 9739A (everything is 
on-board)
Driver: intel-8x0

	Reproduction:

=[1]= Boot, everything is OK. Both 'alsactl store' and amixer produce 
sensible results (alsamixer screen looks messy anyway). The part of 
'alsactl store' result in /etc/asound.state related to PCM is as 
follows (no other PCM controls present):

state.ICH5 {

	. . . . .

	control.26 {
		comment.access 'read write'
		comment.type BOOLEAN
		comment.count 1
		iface MIXER
		name 'PCM Playback Switch'
		value false
	}

	. . . . .
}

=[2]= aplay
^C

And now magig happens :) amixer produce the output which has been in 
my previous post, and 'alsactl store' fails with error message:

alsactl: control.c:2234: snd_ctl_elem_value_get_integer: Assertion 
`idx < sizeof(obj->value.integer.value) / 
sizeof(obj->value.integer.value[0])' failed.
Aborted.

--
Petr


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