Red Hat Bugzilla – Bug 252943
5 channels are not supported in alsa
Last modified: 2014-09-15 23:58:37 EDT
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
Version-Release number of selected component (if applicable):
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,
CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2
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
alsa-init: 5 channels are not supported
AO: [alsa] 48000Hz 5ch s16le (2 bytes per sample)
Video: no video
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
rate: 48000 (48000/1)
[root@localhost ~]# file fivechannels.wav
fivechannels.wav: RIFF (little-endian) data, WAVE audio, 5 channels 44100 Hz
Only 2 channels are open.
5 channels are open.
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.
It's a duplicate of bug 252942.
*** Bug 252942 has been marked as a duplicate of this bug. ***
That's a driver/kernel problem. Moved there.
Anyway, can you please attach /root/scsconfig.log? Is there any device what can
play 5-channel sound?
Created attachment 192351 [details]
Log file, /root/scsconfig.log.
The file /root/scsconfig.log attached. The sound device on my test machine
(Intel Weybridge SDV platform) is Intel ICH9 HD audio controller.
Yeah, the drivers don't export any multichannel device.
Can we test with a 5.2 kernel? The Sigmatel driver was updated (i.e. stac92xx) last release and may resolve the issue. If not a 5.3 pre-release kernel could be tested perhaps as the Sigmatel driver has again been updated with the most recent from upstream.
This Bugzilla has been reviewed by Red Hat and is not planned on being
addressed in Red Hat Enterprise Linux 5, and therefore is being closed.
If this bug is critical to production systems, please contact your Red
Hat support representative and provide a sufficient business justification
in order to re-open it.