[alsa-devel] NVidia AC97 / CK804: arecord hangs in system call poll()
tiwai at suse.de
Sat Jun 30 01:09:21 CEST 2007
At Fri, 29 Jun 2007 13:36:15 +0200,
Rainer Menzner wrote:
> my soundcard is an onboard AC97 CK804 NVidia. I use snd-intel8x0 module.
> Everything works fine except recording sound. When calling
> arecord -f cd buffer.wav
> the program infinitely hangs, and an strace shows that it is a poll()
> call that does not return. After interrupting, a wave file of 44 bytes
> which is the header only is left. My setup is Kernel 126.96.36.199, all
> ALSA-software is updated to the latest version, that is 1.0.14(a).
> In a previous setup with an older ALSA version and kernel 188.8.131.52
> recording did work with the same hardware. Now that I updated all ALSA
> software, even with that older kernel version the same recording problem
> came up. From that I concluded that it is somehow related to the
> ALSA-lib version. I have tried to downgrade ALSA-lib down to 1.0.0 to no
> I have also made tests appropriate if this would be an interrupt problem
> (using pci=noroute et al) which also did not solve the problem.
> I have scrolled though the archives of alsa-user and there have been a
> few posts regarding the same problem (but with other chip sets).
> However, in those threads no definitive solution of the problem has been
> discussed. So I tried it again in alsa-user but did not get any feedback ...
> Now, I finally try this developer list. Your comments and help are much
> appreciated. Let me know if you need further info. I'm not a Linux
> system programmer or specialist, but I would be willing to do some
> debugging if somebody explains what to check.
Most likely a mixer configuration. For example, it's now set up to
record from the SPDIF input or so.
You can check the detailed configuration from the generated file via
"alsactl -f somefile store".
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