Slave PCM not usable (with some HW)

[Dino Puller <dino.puller@xxxxxxxxx>]

Hi all,
   i've two soundcard:

00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 02)    and
0000:00:1f.5 Multimedia audio controller: Intel Corporation 6300ESB
AC'97 Audio Controller (rev 02)

with this .asoundrc:

pcm.multi {
   type multi
   slaves.a.pcm "dmix:0,0" # main sound card
   slaves.a.channels 2
   slaves.b.pcm "dmix:1,0" # aloop sound card
   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.hdaloop_out {
        type route
        slave.pcm "multi"
        slave.channels 4
        ttable.0.0 1
        ttable.1.1 1
        ttable.0.2 1
        ttable.1.3 1
}

pcm.hdaloop_in {
   type multi
   slaves.a.pcm "dsnoop:0,0" # main sound card
   slaves.a.channels 2
   slaves.b.pcm "dsnoop:1,1" # aloop sound card
   slaves.b.channels 2
   bindings.0.slave a
   bindings.0.channel 0
   bindings.1.slave b
   bindings.1.channel 0
}

# default with dmix+softvol & dsnoop
pcm.!default {
    type asym
    playback.pcm {
        type plug
        slave.pcm "hdaloop_out"            	
    }
    capture.pcm {
        type plug
	slave.pcm "dsnoop:0,0"
    }
}

pcm.ear {
    type plug
    slave.pcm "hdaloop_in"
}

It's works fine with the first sound card, but it doesn't works with
the second one ad i obtain "Slave PCM not usable"
I need to remove some plugins to make it works:

pcm.multi {
   type multi
 #  slaves.a.pcm "dmix:0,0" # main sound card
   slaves.a.pcm "hw:0,0" # main sound card
   slaves.a.channels 2
   slaves.b.pcm "dmix:1,0" # aloop sound card
 #  slaves.b.pcm "hw:1,0" # aloop sound card
   slaves.b.channels 2
...
pcm.hdaloop_in {
   type multi
   slaves.a.pcm "dsnoop:0" # main sound card
 #  slaves.a.pcm "hw:0,0" # main sound card
   slaves.a.channels 2
#   slaves.b.pcm "dsnoop:1,1" #,1" # aloop sound card
   slaves.b.pcm "hw:1,1" # aloop sound card
...

But this configuration isn't usable for me.
Tested with alsa driver/lib 1.0.21

any idea?

tnx,
   Dino

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