aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Mark Knecht]

Hi,
   I brought up Alsa Friday on a Gentoo platform and used it for most of
Friday evening and Saturday in one form or another. Along the way I was
building some new kernels to fix some SCSI issues and a few other items,
which required that Alsa get rebuilt also as per the Gentoo Alsa
instructions. This process went on for most of the day. Later Saturday
evening, following who knows how many 'unrelated' changes, Alsa stopped
working. The error messages look like this:

Wizard root # aplay wave/sequen~1.wav 
Playing WAVE 'wave/sequen~1.wav' : Signed 16 bit Little Endian, Rate
44100 Hz, Mono
aplay: pcm_write:1025: write error: Input/output error
Wizard root # 

or when trying to play a game like frozen-bubble, that app locks up hard
and in my console I see:

ALSA Lib pcm_hw.c:467:(snd_pcm_hw_prepare)SNDRV_PCM_IOCTL_PREPARE
failed:device or resource busy

alsaplayer starts to run, sees the CD (I.e. - shows track length) and
then won't play the CD.

I'll attach a bit of data, but can anyone point me toward what might be
causing this? 

-- LSPCI

00:11.5 Multimedia audio controller: VIA Technologies, Inc.
VT8233/A/8235 AC97 Audio Controller (rev 50)
        Subsystem: Asustek Computer, Inc. A7V8X Motherboard (Realtek
ALC650 codec)
        Flags: medium devsel, IRQ 22
        I/O ports at e000 [size=256]
        Capabilities: [c0] Power Management version 2


-- LSMOD

Wizard modules.d # lsmod
Module                  Size  Used by    Not tainted
sr_mod                 14296   0  (autoclean)
ide-scsi                7536   0 
agpgart                11920   0  (autoclean) (unused)
ide-cd                 27080   0  (autoclean)
cdrom                  25984   0  (autoclean) [sr_mod ide-cd]
snd-via82xx            11692   0 
snd-ac97-codec         34624   0  [snd-via82xx]
snd-mpu401-uart         3456   0  [snd-via82xx]
snd-rawmidi            14432   0  [snd-mpu401-uart]
snd-seq-device          4192   0  [snd-rawmidi]
snd-pcm                60928   0  [snd-via82xx]
snd-timer              15240   0  [snd-pcm]
snd                    30852   0  [snd-via82xx snd-ac97-codec
snd-mpu401-uart snd-rawmidi snd-seq-device snd-pcm snd-timer]
snd-page-alloc          4908   0  [snd-via82xx snd-pcm]
Wizard modules.d # 



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Re: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Takashi Iwai]

At 18 May 2003 17:05:32 -0700,
Mark Knecht wrote:
> 
> Hi,
>    I brought up Alsa Friday on a Gentoo platform and used it for most of
> Friday evening and Saturday in one form or another. Along the way I was
> building some new kernels to fix some SCSI issues and a few other items,
> which required that Alsa get rebuilt also as per the Gentoo Alsa
> instructions. This process went on for most of the day. Later Saturday
> evening, following who knows how many 'unrelated' changes, Alsa stopped
> working. The error messages look like this:
> 
> Wizard root # aplay wave/sequen~1.wav 
> Playing WAVE 'wave/sequen~1.wav' : Signed 16 bit Little Endian, Rate
> 44100 Hz, Mono
> aplay: pcm_write:1025: write error: Input/output error
> Wizard root # 
> 
> or when trying to play a game like frozen-bubble, that app locks up hard
> and in my console I see:
> 
> ALSA Lib pcm_hw.c:467:(snd_pcm_hw_prepare)SNDRV_PCM_IOCTL_PREPARE
> failed:device or resource busy
> 
> alsaplayer starts to run, sees the CD (I.e. - shows track length) and
> then won't play the CD.
> 
> I'll attach a bit of data, but can anyone point me toward what might be
> causing this? 

the chip looks like a VIA8235, so the (first) pcm device supports
multiple playbacks but with the same sample rate.
please check whether there is any other app running and using the pcm
device and if it uses different sample rates (e.g. 48kHz)...


Takashi


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Re: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Mark Knecht]

Sorry this is a bit long. Mostly just data. I hope it helps figure this
out. Sort of strange that the chip is identified in one place as a
VIA8233 and in another place as a VIA8235....

On Wed, 2003-05-21 at 04:09, Takashi Iwai wrote:
> At 18 May 2003 17:05:32 -0700,
> Mark Knecht wrote:
> > 
> > Hi,
> >    I brought up Alsa Friday on a Gentoo platform and used it for most of
> > Friday evening and Saturday in one form or another. Along the way I was
> > building some new kernels to fix some SCSI issues and a few other items,
> > which required that Alsa get rebuilt also as per the Gentoo Alsa
> > instructions. This process went on for most of the day. Later Saturday
> > evening, following who knows how many 'unrelated' changes, Alsa stopped
> > working. The error messages look like this:
> > 
> > Wizard root # aplay wave/sequen~1.wav 
> > Playing WAVE 'wave/sequen~1.wav' : Signed 16 bit Little Endian, Rate
> > 44100 Hz, Mono
> > aplay: pcm_write:1025: write error: Input/output error
> > Wizard root # 
> > 
> > or when trying to play a game like frozen-bubble, that app locks up hard
> > and in my console I see:
> > 
> > ALSA Lib pcm_hw.c:467:(snd_pcm_hw_prepare)SNDRV_PCM_IOCTL_PREPARE
> > failed:device or resource busy
> > 
> > alsaplayer starts to run, sees the CD (I.e. - shows track length) and
> > then won't play the CD.
> > 
> > I'll attach a bit of data, but can anyone point me toward what might be
> > causing this? 
> 
> the chip looks like a VIA8235, so the (first) pcm device supports
> multiple playbacks but with the same sample rate.
> please check whether there is any other app running and using the pcm
> device and if it uses different sample rates (e.g. 48kHz)...
> 
> 
> Takashi

Takashi-san,
   To the best of my knowledge there are no other apps using sound in
any way. The environment is fluxbox, which doesn't use sound. I get the
same results in a console after a cold boot before starting fluxbox
also. I've tried playing 48KHz and 44.1KHz wave files and get the same
results.

   There is a strange thing I noticed about how the chip is set up
though. I've loaded the via82xx driver. In /proc/pci the chip identifies
itself as an VIA8233:

Wizard root # grep audio /proc/pci
    Multimedia audio controller: Xilinx, Inc. RME Hammerfall DSP (rev
104).
    Multimedia audio controller: VIA Technologies, Inc. VT8233 AC97
Audio Controller (rev 80).
Wizard root # 

However, in aplay it identifies itself as a VIA 8235:


bash-2.05b$ aplay -l    
**** List of PLAYBACK Hardware Devices ****
card 0: 8235 [VIA 8235], device 0: VIA 8235 [VIA 8235]
  Subdevices: 4/4
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
card 0: 8235 [VIA 8235], device 1: VIA 8235 [VIA 8235]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
bash-2.05b$ 


There are no processes running that are obviously usign audio, as far as
I can see:


bash-2.05b$ ps aux
USER       PID %CPU %MEM   VSZ  RSS TTY      STAT START   TIME COMMAND
root         1  0.2  0.0  1352  496 ?        S    20:54   0:04 init
root         2  0.0  0.0     0    0 ?        SW   20:54   0:00 [keventd]
root         3  0.0  0.0     0    0 ?        SWN  20:54   0:00
[ksoftirqd_CPU0]
root         4  0.0  0.0     0    0 ?        SW   20:54   0:00 [kswapd]
root         5  0.0  0.0     0    0 ?        SW   20:54   0:00 [bdflush]
root         6  0.0  0.0     0    0 ?        SW   20:54   0:00
[kupdated]
root         8  0.0  0.0     0    0 ?        SW   20:54   0:00 [khubd]
root        12  0.0  0.0     0    0 ?        SW   20:54   0:00
[kjournald]
root        36  0.0  0.1  1748  916 ?        S    20:54   0:00
/sbin/devfsd /dev
root       843  0.0  0.1  1428  572 ?        S    20:54   0:00
/usr/sbin/syslogd -m 0
root       846  0.0  0.1  1472  576 ?        S    20:54   0:00
/usr/sbin/klogd -c 3 -2
root       849  0.0  0.1  1472  568 ?        S    20:54   0:00
/usr/sbin/crond
root      1089  0.0  0.2  2732 1284 ?        S    20:54   0:00
/usr/sbin/sshd
xfs       1242  0.0  0.9  6264 4772 ?        S    20:54   0:00 [xfs]
root      1252  0.0  0.2  2288 1236 ?        S    20:54   0:00 [login]
root      1253  0.0  0.0  1336  424 vc/2     S    20:54   0:00
/sbin/agetty 38400 tty2 linux
root      1254  0.0  0.0  1336  424 vc/3     S    20:54   0:00
/sbin/agetty 38400 tty3 linux
mark      1322  0.0  0.2  2292 1372 vc/1     S    20:54   0:00 -bash
mark      1331  0.0  0.1  2036  976 vc/1     S    20:55   0:00 /bin/sh
/usr/X11R6/bin/startx
mark      1342  0.0  0.1  2324  624 vc/1     S    20:55   0:00 xinit
/home/mark/.xinitrc -- -deferglyphs 16
root      1343  0.3  2.5 92644 13356 ?       R    20:55   0:06 [X]
mark      1361  0.0  0.5  5212 2648 vc/1     S    20:55   0:00
/usr/bin/fluxbox
mark      1560  0.0  0.3  3692 1832 ?        S    21:13   0:00
/usr/bin/gconfd-1 12
mark      1628  0.0  0.8  6928 4332 ?        R    21:21   0:00 [xterm]
mark      1629  0.0  0.2  2312 1396 pts/0    S    21:21   0:00 bash
mark      1638  0.0  0.1  2664  800 pts/0    R    21:23   0:00 ps aux



My .asoundrc file is as per the web page I Think:

bash-2.05b$ more .asoundrc 
pcm.via82xx {
type hw
card 0
}

ctl.via82xx {
type hw
card 0
}


The error again:

bash-2.05b$ aplay jazztrap-5-4-groove-28.wav 
Playing WAVE 'jazztrap-5-4-groove-28.wav' : Signed 16 bit Little Endian,
Rate 44100 Hz, Stereo
aplay: pcm_write:1025: write error: Input/output error


bash-2.05b$ su -
Password: 
Wizard root # lsmod
Module                  Size  Used by    Not tainted
radeon                101572   1 
agpgart                11920   3  (autoclean)
ide-cd                 27080   0  (autoclean)
cdrom                  25984   0  (autoclean) [ide-cd]
snd-via82xx            11692   0 
snd-ac97-codec         34624   0  [snd-via82xx]
snd-mpu401-uart         3456   0  [snd-via82xx]
snd-rawmidi            14432   0  [snd-mpu401-uart]
snd-seq-device          4192   0  [snd-rawmidi]
snd-pcm                60928   0  [snd-via82xx]
snd-timer              15240   0  [snd-pcm]
snd                    30852   0  [snd-via82xx snd-ac97-codec
snd-mpu401-uart snd-rawmidi snd-seq-device snd-pcm snd-timer]
snd-page-alloc          4908   0  [snd-via82xx snd-pcm]
Wizard root # 


### modules-update: start processing /etc/modules.d/alsa
# Alsa 0.9.X kernel modules' configuration file.
# $Header:
/home/cvsroot/gentoo-x86/media-sound/alsa-driver/files/alsa-modules.conf-rc,v 1.1 2002/12/21 06:31:52 agenkin Exp $

# ALSA portion
alias char-major-116 snd
# OSS/Free portion
alias char-major-14 soundcore

##
## IMPORTANT:
## You need to customise this section for your specific sound card(s)
## and then run `update-modules' command.
## Read alsa-driver's INSTALL file in /usr/share/doc for more info.
##
##  ALSA portion
alias snd-card-0 snd-via82xx
## alias snd-card-1 snd-ens1371
##  OSS/Free portion
alias sound-slot-0 snd-card-0
## alias sound-slot-1 snd-card-1
##

# OSS/Free portion - card #1
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
##  OSS/Free portion - card #2
## alias sound-service-1-0 snd-mixer-oss
## alias sound-service-1-3 snd-pcm-oss
## alias sound-service-1-12 snd-pcm-oss

alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss

# Set this to the correct number of cards.
options snd cards_limit=1

### modules-update: end processing /etc/modules.d/alsa





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Re: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Takashi Iwai]

At 29 May 2003 21:43:39 -0700,
Mark Knecht wrote:
> 
> Sorry this is a bit long. Mostly just data. I hope it helps figure this
> out. Sort of strange that the chip is identified in one place as a
> VIA8233 and in another place as a VIA8235....
 
in fact, both VIA8233 and 8235 have the same PCI ID.  that's why lspci
shows the same name (while 8235 has the revision 0x50).


Takashi


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RE: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Mark Knecht]

Takashi,
   While I find this interesting, it doesn't address the problem. I sent a
bunch of information and data in the last two emails. Have I sent what you
need? Are you able to make any assessment about why aplay will not work with
this this sound chip on my Asus motherboard?

With best regards,
Mark

> -----Original Message-----
> From: alsa-devel-admin@lists.sourceforge.net
> [mailto:alsa-devel-admin@lists.sourceforge.net]On Behalf Of Takashi Iwai
> Sent: Monday, June 02, 2003 4:12 AM
> To: Mark Knecht
> Cc: Alsa-Devel
> Subject: Re: [Alsa-devel] aplay: pcm_write:1025: write error &
> SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy
>
>
> At 29 May 2003 21:43:39 -0700,
> Mark Knecht wrote:
> >
> > Sorry this is a bit long. Mostly just data. I hope it helps figure this
> > out. Sort of strange that the chip is identified in one place as a
> > VIA8233 and in another place as a VIA8235....
>
> in fact, both VIA8233 and 8235 have the same PCI ID.  that's why lspci
> shows the same name (while 8235 has the revision 0x50).
>
>
> Takashi
>
>
> -------------------------------------------------------
> This SF.net email is sponsored by: eBay
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> _______________________________________________
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> Alsa-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/alsa-devel
>
>




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Re: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Takashi Iwai]

At Mon, 2 Jun 2003 06:41:12 -0700,
Mark Knecht wrote:
> 
> Takashi,
>    While I find this interesting, it doesn't address the problem. I sent a
> bunch of information and data in the last two emails. Have I sent what you
> need? Are you able to make any assessment about why aplay will not work with
> this this sound chip on my Asus motherboard?

well, i'm still not sure how can it happen.
it looks like an unusual case.

anyway, in general, BIOS on some ASUS boards have a bug, and the first
PCM device won't work on them.

could you try to add the module option dxs_support=2 or 3 ?
the option 2  will disable the DXS channel support and works as
VIA8233A chip.  the option 3 suppresses the sample rate 48k only.


Takashi

> 
> With best regards,
> Mark
> 
> > -----Original Message-----
> > From: alsa-devel-admin@lists.sourceforge.net
> > [mailto:alsa-devel-admin@lists.sourceforge.net]On Behalf Of Takashi Iwai
> > Sent: Monday, June 02, 2003 4:12 AM
> > To: Mark Knecht
> > Cc: Alsa-Devel
> > Subject: Re: [Alsa-devel] aplay: pcm_write:1025: write error &
> > SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy
> >
> >
> > At 29 May 2003 21:43:39 -0700,
> > Mark Knecht wrote:
> > >
> > > Sorry this is a bit long. Mostly just data. I hope it helps figure this
> > > out. Sort of strange that the chip is identified in one place as a
> > > VIA8233 and in another place as a VIA8235....
> >
> > in fact, both VIA8233 and 8235 have the same PCI ID.  that's why lspci
> > shows the same name (while 8235 has the revision 0x50).
> >
> >
> > Takashi
> >
> >
> > -------------------------------------------------------
> > This SF.net email is sponsored by: eBay
> > Get office equipment for less on eBay!
> > http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5
> > _______________________________________________
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> > Alsa-devel@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/alsa-devel
> >
> >
> 
> 


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RE: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Mark Knecht]

Takashi,
   Thanks for the fast response. Can you give me the exact format for adding
the module options? I'm not sure which module to add this to, nor have I
ever added module options by hand before. Please be clear as I am not a
software person. /etc/modules.conf? Which line?

Thanks,
Mark

> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai@suse.de]
> Sent: Monday, June 02, 2003 6:56 AM
> To: Mark Knecht
> Cc: Alsa-Devel
> Subject: Re: [Alsa-devel] aplay: pcm_write:1025: write error &
> SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy
>
>
> At Mon, 2 Jun 2003 06:41:12 -0700,
> Mark Knecht wrote:
> >
> > Takashi,
> >    While I find this interesting, it doesn't address the
> problem. I sent a
> > bunch of information and data in the last two emails. Have I
> sent what you
> > need? Are you able to make any assessment about why aplay will
> not work with
> > this this sound chip on my Asus motherboard?
>
> well, i'm still not sure how can it happen.
> it looks like an unusual case.
>
> anyway, in general, BIOS on some ASUS boards have a bug, and the first
> PCM device won't work on them.
>
> could you try to add the module option dxs_support=2 or 3 ?
> the option 2  will disable the DXS channel support and works as
> VIA8233A chip.  the option 3 suppresses the sample rate 48k only.
>
>
> Takashi
>
> >
> > With best regards,
> > Mark
> >
> > > -----Original Message-----
> > > From: alsa-devel-admin@lists.sourceforge.net
> > > [mailto:alsa-devel-admin@lists.sourceforge.net]On Behalf Of
> Takashi Iwai
> > > Sent: Monday, June 02, 2003 4:12 AM
> > > To: Mark Knecht
> > > Cc: Alsa-Devel
> > > Subject: Re: [Alsa-devel] aplay: pcm_write:1025: write error &
> > > SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy
> > >
> > >
> > > At 29 May 2003 21:43:39 -0700,
> > > Mark Knecht wrote:
> > > >
> > > > Sorry this is a bit long. Mostly just data. I hope it helps
> figure this
> > > > out. Sort of strange that the chip is identified in one place as a
> > > > VIA8233 and in another place as a VIA8235....
> > >
> > > in fact, both VIA8233 and 8235 have the same PCI ID.  that's why lspci
> > > shows the same name (while 8235 has the revision 0x50).
> > >
> > >
> > > Takashi
> > >
> > >
> > > -------------------------------------------------------
> > > This SF.net email is sponsored by: eBay
> > > Get office equipment for less on eBay!
> > > http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5
> > > _______________________________________________
> > > Alsa-devel mailing list
> > > Alsa-devel@lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/alsa-devel
> > >
> > >
> >
> >
>
>




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Re: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Takashi Iwai]

At Mon, 2 Jun 2003 07:20:05 -0700,
Mark Knecht wrote:
> 
> Takashi,
>    Thanks for the fast response. Can you give me the exact format for adding
> the module options? I'm not sure which module to add this to, nor have I
> ever added module options by hand before. Please be clear as I am not a
> software person. /etc/modules.conf? Which line?

just add the following line to the end of /etc/modules.conf:

	options snd-via82xx dxs_support=2

(or dxs_support=3)

and run "/etc/init.d/alsasound restart".

note that the option above is available only on the very recent ALSA 
version.


ciao,

Takashi


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RE: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Mark Knecht]

>
> just add the following line to the end of /etc/modules.conf:
>
> 	options snd-via82xx dxs_support=2
>
> (or dxs_support=3)
>
> and run "/etc/init.d/alsasound restart".
>
> note that the option above is available only on the very recent ALSA
> version.
>
>
> ciao,
>
> Takashi

Thanks. That's very clear. I'll try it this evening. (At work right now.)

As for Alsa versions, this is a Gentoo ebuild of Alsa. It identifies itself
as '0.9.3c-r1'. (Is that right? I might have thought 0.9.3-rc1?) Anyway,
that's what it says. New enough for these options?

Thanks much!

Mark




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RE: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Mark Knecht]

>
> anyway, in general, BIOS on some ASUS boards have a bug, and the first
> PCM device won't work on them.
>

Can I tell aplay to use any other PCM device? The second device? How might I
do this?

aplay hw:1 sound.wav???




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Re: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Takashi Iwai]

At Mon, 2 Jun 2003 07:33:47 -0700,
Mark Knecht wrote:
> 
> >
> > just add the following line to the end of /etc/modules.conf:
> >
> > 	options snd-via82xx dxs_support=2
> >
> > (or dxs_support=3)
> >
> > and run "/etc/init.d/alsasound restart".
> >
> > note that the option above is available only on the very recent ALSA
> > version.
> >
> >
> > ciao,
> >
> > Takashi
> 
> Thanks. That's very clear. I'll try it this evening. (At work right now.)
> 
> As for Alsa versions, this is a Gentoo ebuild of Alsa. It identifies itself
> as '0.9.3c-r1'. (Is that right? I might have thought 0.9.3-rc1?) Anyway,
> that's what it says. New enough for these options?

hmm..  sorry, i can't remember.

just try and check /proc/asound/card0 whether pcm2p directory exists
there :)


Takashi


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Re: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Takashi Iwai]

At Mon, 2 Jun 2003 07:35:49 -0700,
Mark Knecht wrote:
> 
> >
> > anyway, in general, BIOS on some ASUS boards have a bug, and the first
> > PCM device won't work on them.
> >
> 
> Can I tell aplay to use any other PCM device? The second device? How might I
> do this?
> 
> aplay hw:1 sound.wav???

please use -D option, for example,

	% aplay -D hw:0,1 sound.wav

for the second pcm device.  the first 0 means the first "card" and you
cannot ommit it to specify the pcm device number.


Takashi


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RE: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[David E. Storey]

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most likely,

aplay -D hw:1,0 sound.wav

d!

On Mon, 2003-06-02 at 10:35, Mark Knecht wrote:
> >
> > anyway, in general, BIOS on some ASUS boards have a bug, and the first
> > PCM device won't work on them.
> >
> 
> Can I tell aplay to use any other PCM device? The second device? How might I
> do this?
> 
> aplay hw:1 sound.wav???
> 
> 
> 
> 
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RE: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Mark Knecht]

> >
> > aplay hw:1 sound.wav???
>
> please use -D option, for example,
>
> 	% aplay -D hw:0,1 sound.wav
>
> for the second pcm device.  the first 0 means the first "card" and you
> cannot ommit it to specify the pcm device number.
>

Thanks. This explanation makes sense. I'll try it out this evening and get
back to you then.

Cheers,
Mark




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Re: aplay: pcm_write:1025: write error & SNDRV_PCM_IOCTL_PREPAREfailed:device or resource busy

[Mark Knecht]

On Mon, 2003-06-02 at 07:25, Takashi Iwai wrote:

> just add the following line to the end of /etc/modules.conf:
> 
> 	options snd-via82xx dxs_support=2
> 
> (or dxs_support=3)
> 
> and run "/etc/init.d/alsasound restart".
> 
> note that the option above is available only on the very recent ALSA 
> version.

A solution is found! But I'd like to understand why the other failed:

Wizard root # aplay -D hw:0,1 /home/mark/data/wave/seque~10.wav 
Playing WAVE '/home/mark/data/wave/seque~10.wav' : Signed 16 bit Little
Endian, Rate 44100 Hz, Mono

And I get sound just fine...

Why is specifying the device required? As root I have no .asoundrc file,
but as a user I do:


pcm.via82xx {
    type hw
    card 0
}

ctl.via82xx {
    type hw
    card 0
}



Apparently my version is not new enough for your new option:

Wizard modules.d # /etc/init.d/alsasound restart
 * Shutting down ALSA
modules....                                         [ ok ]
 * Initialising ALSA....
 * Starting sound driver: snd-via82xx Warning: ignoring dxs_support=2,
no such parameter in this module
Module snd-via82xx loaded, with
warnings                                  [ ok ]
 
Wizard modules.d # 

And pcm2p did not exist...

Wizard root # ls /proc/asound/card0/
ac97#0  ac97#0regs  id  pcm0c  pcm0p  pcm1c  pcm1p
Wizard root # 


Wizard root # aplay -v /home/mark/data/wave/seque~10.wav 
Playing WAVE '/home/mark/data/wave/seque~10.wav' : Signed 16 bit Little
Endian, Rate 44100 Hz, Mono
Plug PCM: Hardware PCM card 0 'VIA 8235' device 0 subdevice 0

Its setup is:
stream       : PLAYBACK
access       : RW_INTERLEAVED
format       : S16_LE
subformat    : STD
channels     : 1
rate         : 44100
exact rate   : 44100 (44100/1)
msbits       : 16
buffer_size  : 22050
period_size  : 4410
period_time  : 100000
tick_time    : 10000
tstamp_mode  : NONE
period_step  : 1
sleep_min    : 0
avail_min    : 4410
xfer_align   : 4410
start_threshold  : 22050
stop_threshold   : 22050
silence_threshold: 0
silence_size : 0
boundary     : 1445068800
aplay: pcm_write:1025: write error: Input/output error
Wizard root # 






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