[alsa-devel] [PATCH]Support MCP89 and GT21x hdmi audio

Jaroslav Kysela perex at perex.cz
Thu Mar 11 08:30:21 CET 2010

On Wed, 10 Mar 2010, VDR User wrote:

> [pid 22651] ioctl(21, 0x80044121, 0xb439d2cc) = -1 EPIPE (Broken pipe)
> pcm_hw.c: snd_pcm_hw_delay() SNDRV_PCM_IOCTL_DELAY failed.

-EPIPE means underrun condition.

Try 'echo 101 > /proc/asound/card0/pcm0p/xrun_debug' and send dmesg 
output to check if the ring buffer pointer in the hda-intel driver does 
not return wrong values. Replace card0 and pcm0p with right identifiers 
(look to 'aplay -l' for right numbers).

More info: http://www.alsa-project.org/main/index.php/XRUN_Debug


Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.

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