Re: [Alsa-user] alsa 0.9 with a cs4237b -> 2.4.19 kernel freeze

[alsa u. <al...@we...>]

Takashi Iwai wrote:

>At Fri, 29 Nov 2002 01:12:28 -0600,
>alsa user wrote:
>
>>
>>Using a Crystal cs4237B device with ALSA drivers from either
>>the stable release or the latest development release.
>>When opening and reading from the audio device (/dev/audio
>>or /dev/dsp0) the system hangs. [Opening the device for write
>>only is no problem -- and playing music works great.]
>>
>>With latest 0.9 release things are definitely better (than with 0.5),
>>but reading /dev/audio or /dev/dsp0 still causes same lockup.
>>
>>What works:
>>It is possible to record audio using "arecord" or "record" and at the
>>same time play some tune in a different Unix process using "aplay"
>>(and ALSA playing quality is outstanding!). It is also possible
>>to do conference calls with gnomemeeting, however once in a while
>>the kernel will still freeze.
>>
>>What never works: kernel will always freeze within a second
>>of reading from /dev/dsp0 or /dev/audio (e.g. cat /dev/dsp0).
>>Detailed configurations attached.
>>
>
>it sounds like a problem on OSS emulation.
>could you try to playback and capture at the same time _via OSS
>emulation_ ?  it doesn't matter whether it's a single process or not.
>just run e.g. "play" and "rec" (both from sox) at the same time.
>
using rec to record audio freezes the computer even without running
play in the background. Apparently only "arecord" and "record" are
stable way to record in this configuration. Anything else I should try?
I have turned debugging on the kernel but not sure what to look for
after a reboot in this case.