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 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.
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] /root/scsconfig.log 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.