[meta-fsl-arm-extra] Strange audio behaviour on SabreLite

[meta-fsl-arm-extra] Strange audio behaviour on SabreLite

[Gary Thomas]

I'm using the 3.0.35 kernel on my SabreLite.  I found that
once I plug in an HDMI monitor, the SGTL-5000 audio vanishes.
It stays missing, even when the board is reset (switch or
by reboot), until a power cycle.

I've not tested this with the 3.10 kernel yet.

Is this expected?  or at least has anyone else seen it?

Thanks

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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Re: [meta-fsl-arm-extra] Strange audio behaviour on SabreLite

[Daiane Angolini]

> I'm using the 3.0.35 kernel on my SabreLite.  I found that
> once I plug in an HDMI monitor, the SGTL-5000 audio vanishes.
> It stays missing, even when the board is reset (switch or
> by reboot), until a power cycle.

Do you know how your HDMI audio is configured?

Daiane

Re: [meta-fsl-arm-extra] Strange audio behaviour on SabreLite

[Gary Thomas]

On 2014-06-10 11:47, Daiane Angolini wrote:
>> I'm using the 3.0.35 kernel on my SabreLite.  I found that
>> once I plug in an HDMI monitor, the SGTL-5000 audio vanishes.
>> It stays missing, even when the board is reset (switch or
>> by reboot), until a power cycle.
>
> Do you know how your HDMI audio is configured?

Default image, built using Yocto (no tailoring).

The odd thing is that the SGTL-5000 works perfectly if I never
plug in the HDMI.

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

Re: [meta-fsl-arm-extra] Strange audio behaviour on SabreLite

[Daiane Angolini]

>>> I'm using the 3.0.35 kernel on my SabreLite.  I found that
>>> once I plug in an HDMI monitor, the SGTL-5000 audio vanishes.
>>> It stays missing, even when the board is reset (switch or
>>> by reboot), until a power cycle.
>>
>>
>> Do you know how your HDMI audio is configured?
>
>
> Default image, built using Yocto (no tailoring).

I don't remember what is the default for sabrelite board.

>
> The odd thing is that the SGTL-5000 works perfectly if I never
> plug in the HDMI.

It looks like, for me, your audio is configured to use the HDMI audio
(spdif?) when it's present, by default

aplay -l to see your cards

asound.conf or asound.state to see your configuration

for example:
http://git.yoctoproject.org/cgit/cgit.cgi/meta-fsl-arm/tree/recipes-bsp/alsa-state/alsa-state/mx6?h=master



Daiane

Re: [meta-fsl-arm-extra] Strange audio behaviour on SabreLite

[John Weber]

>>>> I'm using the 3.0.35 kernel on my SabreLite.  I found that
>>>> once I plug in an HDMI monitor, the SGTL-5000 audio vanishes.
>>>> It stays missing, even when the board is reset (switch or
>>>> by reboot), until a power cycle.
Does the SGTL5000 share the same I2C bus with the HDMI I2C (DDC) port on the 
SabreLite?  If so, could the problem be that the DDC port is pulling the bus 
down or otherwise interfering with it?

Re: [meta-fsl-arm-extra] Strange audio behaviour on SabreLite

[Gary Thomas]

On 2014-06-10 12:08, John Weber wrote:
>
>>>>> I'm using the 3.0.35 kernel on my SabreLite.  I found that
>>>>> once I plug in an HDMI monitor, the SGTL-5000 audio vanishes.
>>>>> It stays missing, even when the board is reset (switch or
>>>>> by reboot), until a power cycle.
> Does the SGTL5000 share the same I2C bus with the HDMI I2C (DDC) port on the SabreLite?  If so, could the problem be that the DDC port is pulling the bus down or otherwise
> interfering with it?

No, they are on different I2C busses.

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

Re: [meta-fsl-arm-extra] Strange audio behaviour on SabreLite

[Gary Thomas]

On 2014-06-10 12:02, Daiane Angolini wrote:
>>>> I'm using the 3.0.35 kernel on my SabreLite.  I found that
>>>> once I plug in an HDMI monitor, the SGTL-5000 audio vanishes.
>>>> It stays missing, even when the board is reset (switch or
>>>> by reboot), until a power cycle.
>>>
>>>
>>> Do you know how your HDMI audio is configured?
>>
>>
>> Default image, built using Yocto (no tailoring).
>
> I don't remember what is the default for sabrelite board.
>
>>
>> The odd thing is that the SGTL-5000 works perfectly if I never
>> plug in the HDMI.
>
> It looks like, for me, your audio is configured to use the HDMI audio
> (spdif?) when it's present, by default
>
> aplay -l to see your cards
>
> asound.conf or asound.state to see your configuration
>
> for example:
> http://git.yoctoproject.org/cgit/cgit.cgi/meta-fsl-arm/tree/recipes-bsp/alsa-state/alsa-state/mx6?h=master

All this is working as expected, but it's not what I'm asking about.

The problem is that if I plug in the HDMI, I can *NEVER* use the
internal (SGTL5000) audio again, even when I unplug the HDMI.
Neither rebooting, nor resetting the  board using the switch
restores the internal audio.  However, if I cycle the power
and boot with the HDMI not connected, it works again.

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------