linux-kernel - Re: [alsa-devel] [PATCH]Support MCP89 and GT21x hdmi audio

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Message-ID: <a3ef07921003111015x2386cc80x73a2a4bd679b1fe1@mail.gmail.com>
Date:	Thu, 11 Mar 2010 10:15:52 -0800
From:	VDR User <user.vdr@...il.com>
To:	Jaroslav Kysela <perex@...ex.cz>
Cc:	Wu Fengguang <fengguang.wu@...el.com>, Wei Ni <wni@...dia.com>,
	Takashi Iwai <tiwai@...e.de>,
	alsa-devel <alsa-devel@...a-project.org>,
	Jaroslav Kysela <jkysela@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm <akpm@...ux-foundation.org>,
	Pavel Hofman <pavel.hofman@...ite.cz>
Subject: Re: [alsa-devel] [PATCH]Support MCP89 and GT21x hdmi audio

On Wed, Mar 10, 2010 at 11:30 PM, Jaroslav Kysela <perex@...ex.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
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