On Tue, 9 Mar 2010, VDR User wrote:

> On Sun, Mar 7, 2010 at 8:46 PM, Wu Fengguang <fengguang.wu@intel.com> wrote:
>> CC Jaroslav, maybe he has some idea on
>>
>>        pcm_hw.c: snd_pcm_hw_delay() SNDRV_PCM_IOCTL_DELAY failed.
>>
>> On Mon, Mar 08, 2010 at 12:35:37PM +0800, Wei Ni wrote:
>>> Hi,
>>> Because I don't have GT220 card on hand, I didn't test it yet.
>>> So I didn't add this card to the patch file. I think you could add it after
>>> you test it.
>>>
>>> About the warning messages, I don't know why.
>>> May be some others can answer.
>>>
>>> Thanks
>>> Wei.
>>> nvpublic
>>>
>>> -----Original Message-----
>>> From: VDR User [mailto:user.vdr@gmail.com]
>>> Sent: Monday, March 08, 2010 3:22 AM
>>> To: Wei Ni
>>> Cc: Takashi Iwai; akpm; alsa-devel; Wu Fengguang; linux-kernel; Pavel Hofman
>>> Subject: Re: [alsa-devel] [PATCH]Support MCP89 and GT21x hdmi audio
>>>
>>> I think this may be relevant to this subject, if not then my apologies.
>>>
>>> I've just installed a GT220 card and was able to get audio-over-hdmi
>>> working by compiling the snapshot drivers from 20100307 which contain
>>> Wei's new code.  I further had to patch the driver to recognize my
>>> card with:
>>>
>>> --- alsa-driver-orig/alsa-kernel/pci/hda/patch_nvhdmi.c 2010-03-06
>>> 18:00:12.000000000 -0800
>>> +++ alsa-driver/alsa-kernel/pci/hda/patch_nvhdmi.c      2010-03-06
>>> 18:02:00.000000000 -0800
>>> @@ -1335,6 +1335,8 @@ static struct hda_codec_preset snd_hda_p
>>>           .patch = patch_nvhdmi_8ch_89 },
>>>         { .id = 0x10de000b, .name = "GT21x HDMI",
>>>           .patch = patch_nvhdmi_8ch_89 },
>>> +       { .id = 0x10de000a, .name = "GT220 HDMI",
>>> +         .patch = patch_nvhdmi_8ch_89 },
>>>         { .id = 0x10de000d, .name = "GT240 HDMI",
>>>           .patch = patch_nvhdmi_8ch_89 },
>>>         {} /* terminator */
>>> @@ -1347,6 +1349,7 @@ MODULE_ALIAS("snd-hda-codec-id:10de0006"
>>>  MODULE_ALIAS("snd-hda-codec-id:10de0007");
>>>  MODULE_ALIAS("snd-hda-codec-id:10de0067");
>>>  MODULE_ALIAS("snd-hda-codec-id:10de8001");
>>> +MODULE_ALIAS("snd-hda-codec-id:10de000a");
>>>  MODULE_ALIAS("snd-hda-codec-id:10de000c");
>>>  MODULE_ALIAS("snd-hda-codec-id:10de000b");
>>>  MODULE_ALIAS("snd-hda-codec-id:10de000d");
>>>
>>> This seems to work fine when running VDR but if I do anything else
>>> like upgrade packages, compile something, or maybe create a bz2, then
>>> I start to see _a lot_ of the following in my xine log:
>>>
>>> pcm_hw.c: snd_pcm_hw_delay() SNDRV_PCM_IOCTL_DELAY failed.
>>>
>>> With the old code this didn't happen.  However, my setup was an 8400gs
>>> using SPDIF OUT from my mainboard to SPDIF IN on the card.  Then using
>>> a dvi->hdmi cable into the tv.
>>>
>>> Again, I apologize if I'm posting this in the wrong place.
>>>
>>> Best regards.
>
> So nobody has any ideas at all?  This is turning out to be a big
> problem and I've discovered it will occur even without anything else
> happening on the system.  (originally I thought you needed to do some
> other activity.)  I've checked with some other devs I know and
> everyone has said the problem is with alsa so it would seem there is a
> serious bug somewhere since eventually those errors will happen and
> the audio will start skipping like crazy.
>
> Please let me know if there's anything I can do within my ability to help.

Could you do strace for ALSA ioctls? At least having the error code might 
help to identify this issue.

 					Jaroslav

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