Description of problem:
I tested RHEL5.1-snapshot-1 kernel-2.6.18-37.el5-x86_64 on Intel Weybridge SDV 
platform.  The codec is SigmaTel STAC9274D.

When playing a 5 channels audio file, there is an error message "alsa-init: 5 
channels are not supported".  I checked 
file /proc/asound/card0/pcm0p/sub0/hw_params and found only 2 channels are 
open.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:

1. Play the audio file,
[root@localhost ~]# mplayer fivechannels.wav
MPlayer 1.0rc1-4.1.2 (C) 2000-2006 MPlayer Team
CPU: Intel(R) Core(TM)2 Duo CPU      6600  @ 2.40GHz (Family: 6, Model: 15, 
Stepping: 9)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2

Playing fivechannels.wav.
Audio file file format detected.
==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 44100 Hz, 5 ch, s16le, 3528.0 kbit/100.00% (ratio: 441000->441000)
Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file or 
directory
alsa-init: 5 channels are not supported
AO: [alsa] 48000Hz 5ch s16le (2 bytes per sample)
Video: no video
Starting playback...
A:   0.4 (00.3) of 0.7 (00.6)  1.3%

Exiting... (End of file)

2. At the same time, check hw_params,
[root@localhost ~]# cat /proc/asound/card0/pcm0p/sub0/hw_params
access: MMAP_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 1024
buffer_size: 16384
tick_time: 1000

[root@localhost ~]# file fivechannels.wav
fivechannels.wav: RIFF (little-endian) data, WAVE audio, 5 channels 44100 Hz

  
Actual results:
Only 2 channels are open.

Expected results:
5 channels are open.

Additional info:
The attached file is a 5 channels WAVE file with only data in center channel.  
So the expectation of playing this file is to get sound only in center 
channel.  From the current test result, there is no sound in center channel.