Bug#606482: no headphone output on ASUS M4A785T-D motherboard
Sergio Gelato wrote:
> If you say so. I don't claim any real expertise in this area. I do note that
> http://www.intel.com/support/motherboards/desktop/sb/cs-020642.htm#standards
jlandonx at Intel wrote:
> You can also physically check the audio cable of the front panel audio
> solution. If there is a cable connected to Pin 4, you have an HD Audio
> module; if there is no cable to Pin 4, you have an AC97 module.
And:
> HD front panel audio solutions should be plugged into HD onboard
> headers. AC’97 front panel audio solutions should be plugged into
> AC’97 onboard headers. Some AC’97 front panel audio solutions (but
> not all) may work with HD onboard headers. If you want connect an
> AC’97 front panel audio system to HD onboard headers, try these steps:
>
> Connect Mic_IN (MIC) to MIC2_L.
> Connect Audio_R (RIN) to OUT2_R
> Connect Audio_L (LIN) to OUT2_L.
> MIC_RET and OUT_RET are for HD audio only; you don't need to connect
> them for AC'97 audio.
>
> Intel does not validate AC’97 front panel audio solutions with boards
> using HD audio. If the steps above do not work, you will need to use
> an HD front panel audio solution for full compatibility with Intel
> Desktop Boards using Intel 945 chipsets and later.
I don't know if there's a way for the BIOS to automatically detect the
front panel type, but now we're way out of kernel land, so yes, that
doesn't make it sound like a major kernel bug. ;-)
However, it seems odd to me that an older kernel (from Ubuntu 10.04)
worked fine. Doesn't that suggest there might be a possible
workaround? Maybe as suggested in [1] this is a jack sense problem
and 1731437 (ALSA: HDA VIA: Add low current mode for power saving.,
2009-10-10) triggered trouble and if we can detect this condition all
we might need is a way to force the jack to power up.
Curious,
Jonathan
[1] https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5309#c23449
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