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Date:   Mon, 18 Feb 2019 16:40:36 +0100
From:   Paul Menzel <pmenzel+alsa-devel@...gen.mpg.de>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: snd_hda_codec_hdmi: `hdaudio hdaudioC0D2: Unable to bind the
 codec`

Dear Takashi,


On 02/18/19 16:38, Takashi Iwai wrote:
> On Mon, 18 Feb 2019 16:17:30 +0100, Paul Menzel wrote:
>>
>>>> Then, I built the HDA subsystem as a module, but that also did not help.
>>>> The DRM subsystem is started after the HD-audio subsystem.
>>>>
>>>> ```
>>>> $ grep -e SND_HDA= -e SND_HDA_INTEL /boot/config-4.20.8.mx64.245 
>>>> CONFIG_SND_HDA=m
>>>> CONFIG_SND_HDA_INTEL=m
>>>
>>> That's odd.  In sound/hda/hdac_i915.c there is an explicit
>>> request_module("i915"), and at that point, it has a 10 second
>>> timeout.  If this isn't enough, try to raise the number, e.g. 60
>>> seconds.
>>
>> I tried as you suggested, and increased it to 60 seconds.
>>
>>     sed -i 's/msecs_to_jiffies(10 * 1000))/msecs_to_jiffies(60 * 1000))/' sound/hda/hdac_i915.c
>>
>> That seems to have fixed it.
>>
>> ```
>> $ grep _hda_ 20190218–linux_4.20.10–dmesg.txt
>> [   15.568061] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
>> [   15.706898] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC671: line_outs=1 (0x21/0x0/0x0/0x0/0x0) type:line
>> [   15.708754] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=1 (0x17/0x0/0x0/0x0/0x0)
>> [   15.710249] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x14/0x0/0x0/0x0/0x0)
>> [   15.712031] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
>> [   15.712348] snd_hda_codec_realtek hdaudioC0D0:    inputs:
>> [   15.712619] snd_hda_codec_realtek hdaudioC0D0:      Front Mic=0x19
>> [   15.712929] snd_hda_codec_realtek hdaudioC0D0:      Rear Mic=0x18
>> [   15.713234] snd_hda_codec_realtek hdaudioC0D0:      Line=0x1a
>> ```
>>
>> So the time-out, needs to be increased.
> 
> OK, I'm going to extend the value.  I thought a minute would be too
> long, and I naively assumed that the recent machines were fast
> enough.  Maybe 60 isn't too bad after all.

Thank you. Maybe also log times greater than one(?) second, so the user
is aware of these delays and connection between subsystems.


Kind regards,

Paul


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