From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: Problem with multiopen on SB Audigy 2
Date: Tue, 07 Oct 2003 19:08:15 +0200
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To: James Courtier-Dutton <James@superbug.demon.co.uk>
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At Tue, 07 Oct 2003 18:00:22 +0100,
James Courtier-Dutton wrote:
> 
> I have 2 sound cards, card 0 is the motherboard intel/alc650 one, and 
> card 1 is a SB Audigy2
> 
> Playing two streams at once on device "front:1" works: -
> aplay -D front:1 filename.wav
> aplay -D front:1 filename.wav
> So, this is playing two files to the SB Audigy2 front speakers.
> I can hear the two files being mixed together and output together to a 
> single set of speakers.
> 
> Playing two streams at once on device "rear:1" fails: -
> aplay -D rear:1 filename.wav
> aplay -D rear:1 filename.wav
> So, this is trying to play two files to the SB Audigy2 rear speakers.
> 
> The first files comes out of the rear speakers, but the output from the 
> second aplay command fails with: -
> 
> bash-2.05b# aplay -D rear:1 filename.wav
> Playing WAVE 'filename.wav' : Signed 16 bit Little Endian, Rate 44100 
> Hz, Stereo
> ALSA lib setup.c:94:(snd_sctl_install) Cannot lock ctl elem
> aplay: set_params:876: Unable to install hw params:
> ACCESS:  RW_INTERLEAVED
> FORMAT:  S16_LE
> SUBFORMAT:  STD
> SAMPLE_BITS: 16
> FRAME_BITS: 32
> CHANNELS: 2
> RATE: 44100
> PERIOD_TIME: (125011 125012)
> PERIOD_SIZE: 5513
> PERIOD_BYTES: 22052
> PERIODS: 2
> BUFFER_TIME: (250022 250023)
> BUFFER_SIZE: 11026
> BUFFER_BYTES: 44104
> TICK_TIME: 1000
> 
> Can you explain why this might be happening?

this is because the "Wave Surround Playback Volume" control is locked
by the first rear stream.
you can find it in /usr/share/alsa/cards/Audigy2.conf.
please try to remove the lock.


Takashi


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