[PATCH] alsa-lib: Conf: Fix channels of ICE1712 to 10/12

[PATCH] alsa-lib: Conf: Fix channels of ICE1712 to 10/12

[David Henningsson]

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I know this issue has been brought up before, without resolution. 
Basically PulseAudio cannot open cards such as M-Audio 2496 and M-Audio 
Delta 1010LT because it does not try to open "front" with 10 channels, 
only with 2.

I think it is reasonable to assume that a front:x stream should be able 
to open with 2 channels only, therefore I'm proposing this fix, and I'm 
applying it to Ubuntu as well, unless you have a better idea.

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic

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>From caf7ba000b5d09bd073028392235c14f34e63b97 Mon Sep 17 00:00:00 2001
From: David Henningsson <david.henningsson@canonical.com>
Date: Mon, 28 Mar 2011 10:19:16 +0200
Subject: [PATCH] Conf: Fix channels of ICE1712 to 10/12

The ICE1712 kernel driver accepts 10 playback channels and
12 recording channels only. Therefore fix this channel count
in alsa-lib.

BugLink: http://bugs.launchpad.net/bugs/178442
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
---
 src/conf/cards/ICE1712.conf |   28 ++++++++++++++++++++++------
 1 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/src/conf/cards/ICE1712.conf b/src/conf/cards/ICE1712.conf
index 01e50d2..f5b8add 100644
--- a/src/conf/cards/ICE1712.conf
+++ b/src/conf/cards/ICE1712.conf
@@ -32,12 +32,26 @@ ICE1712.pcm.front.0 {
 	@args.CARD {
 		type string
 	}
-	type route
-	ttable.0.0 1
-	ttable.1.1 1
-	slave.pcm {
-		type hw
-		card $CARD
+	type asym
+	playback.pcm {
+		type route
+		ttable.0.0 1
+		ttable.1.1 1
+		slave.pcm {
+			type hw
+			card $CARD
+		}
+		slave.channels 10
+	}
+	capture.pcm {
+		type route
+		ttable.0.0 1
+		ttable.1.1 1
+		slave.pcm {
+			type hw
+			card $CARD
+		}
+		slave.channels 12
 	}
 }	
 
@@ -57,6 +71,7 @@ ICE1712.pcm.surround40.0 {
 		type hw
 		card $CARD
 	}
+	slave.channels 10
 }	
 
 <confdir:pcm/surround41.conf>
@@ -79,6 +94,7 @@ ICE1712.pcm.surround51.0 {
 		type hw
 		card $CARD
 	}
+	slave.channels 10
 }
 
 <confdir:pcm/iec958.conf>
-- 
1.7.4.1


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Re: [PATCH] alsa-lib: Conf: Fix channels of ICE1712 to 10/12

[Jaroslav Kysela]

On Mon, 28 Mar 2011, David Henningsson wrote:

> I know this issue has been brought up before, without resolution. Basically 
> PulseAudio cannot open cards such as M-Audio 2496 and M-Audio Delta 1010LT 
> because it does not try to open "front" with 10 channels, only with 2.
>
> I think it is reasonable to assume that a front:x stream should be able to 
> open with 2 channels only, therefore I'm proposing this fix, and I'm applying 
> it to Ubuntu as well, unless you have a better idea.

I applied your change to our git repo . Perhaps we find a better solution 
in future.

 					Jaroslav

-----
Jaroslav Kysela <perex@perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.

Re: [PATCH] alsa-lib: Conf: Fix channels of ICE1712 to 10/12

[Raymond Yau]

2011/3/28 Jaroslav Kysela <perex@perex.cz>

> On Mon, 28 Mar 2011, David Henningsson wrote:
>
> > I know this issue has been brought up before, without resolution.
> Basically
> > PulseAudio cannot open cards such as M-Audio 2496 and M-Audio Delta
> 1010LT
> > because it does not try to open "front" with 10 channels, only with 2.
> >
> > I think it is reasonable to assume that a front:x stream should be able
> to
> > open with 2 channels only, therefore I'm proposing this fix, and I'm
> applying
> > it to Ubuntu as well, unless you have a better idea.
>
> I applied your change to our git repo . Perhaps we find a better solution
> in future.
>
>                                        Jaroslav
>

But front device cannot be used for capture

I have used David 's alsamixertest to verify that using "front" device of
HDA intel for playback/capture , the softvol plugin "PCM Playback Volume
affect the dB scale