[mythtv-users] error at prealloc audio buffer

Josu Lazkano josu.lazkano at gmail.com
Sun Sep 18 20:20:26 UTC 2011

Hello all, I am having some errors on Nvidia ION frontend:

2011-09-18 14:07:40.924 ALSA, Error: Error opening
/proc/asound/card0/pcm3p/sub0/prealloc: Permission denied.
2011-09-18 14:07:40.924 ALSA, Error: Try to manually increase audio
buffer with: echo 128 | sudo tee

I try to increase it manually, I execute it: (I add frontend user to sudoers)

echo 128 | sudo tee /proc/asound/card0/pcm3p/sub0/prealloc

I get this on dmesg:

[35928.171738] data write error to prealloc (-16)

And there is no buffer change, it continue with same value. It must
execute with no playback, on playback there is no change.

I read that this is not necessary, I am having some playback problems
and I don't know if it is related to this.

I will appreciate any help. Thanks and best regards.

Josu Lazkano

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