From mboxrd@z Thu Jan  1 00:00:00 1970
From: VDR User <user.vdr@gmail.com>
Subject: Re: [PATCH]Support MCP89 and GT21x hdmi audio
Date: Thu, 11 Mar 2010 10:15:52 -0800
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To: Jaroslav Kysela <perex@perex.cz>
Cc: Wei Ni <wni@nvidia.com>, Takashi Iwai <tiwai@suse.de>, alsa-devel <alsa-devel@alsa-project.org>, Jaroslav Kysela <jkysela@redhat.com>, linux-kernel <linux-kernel@vger.kernel.org>, akpm <akpm@linux-foundation.org>, Wu Fengguang <fengguang.wu@intel.com>, Pavel Hofman <pavel.hofman@insite.cz>
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On Wed, Mar 10, 2010 at 11:30 PM, Jaroslav Kysela <perex@perex.cz> wrote:
> 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

Hi, thanks for your further reply.  However, I don't see
"CONFIG_SND_PCM_XRUN_DEBUG" anywhere in the kernel config (both in
menuconfig or .config).  Also, in order to use the snapshot I had to
disable ALSA in my kernel anyways.  I did try to enable it just to see
if that option would appear somewhere but it did not.  I am using
stable kernel 2.6.33 btw.  I don't see how I can create
/proc/asound/card1/pcm3p/xrun_debug!

Best regards,
Derek