[alsa-devel] Dell XPS 13 (Codec: IDT 92HD73C1X5) and 3 stereo jack output

[Ruben Van Boxem]

2011/5/29 Ruben Van Boxem <vanboxem.ruben at gmail.com>:
> Hi,
>
> I have been trying to get my Dell XPS 13 to output 5.1 sound through
> the stereo jacks (because the NVIDIA HDMI only does 2.1). Attached is
> alsa-info output. I can't seem to be able to set the Line/Mic In to
> output.
>
> I have tried several things, going from fiddling with Kmix to fiddling
> with the modprobe "model=" parameter, and even looking through the
> hda_analyzer.py output. This last one lifted a tiny corner of the
> solution, but I don't think a vanilla Alsa install will get me through
> this.
>
> In Windows, I can use the three jacks to output 2 channels each, so I
> am sure the hardware is capable of it. In HDA analyzer I can see that
> there are several "Line Out" entries, but since they all have the node
> cap "Unsolicited Capabilities", I'm pretty sure the problem is alsa
> not knowing about the, well, capabilities.
>
> I searched the web and documentation for anything sane to try, but
> nothing worked. The default modprobe "model=" is the best (I can get
> 4.0 output from the jacks, and everything works, except the third
> jack).
>
> If you need more input or information, please ask, I'm very willing to
> get this solved!
>
> Thanks,
>
> Ruben
>

I have been able to produce output from the third jack fiddling with
hda_analyzer. The diff is attached. I'm sure it is far from optimal,
but at least shows which pin needs modification. Plugging into the
jack won't mute the speakers, but I guess it needs the same settings
as the first two jacks (which do mute the speaker). With this
modification, I get the same output from the right jack as from the
left jack (meaning the front left and front right channels of a 5.1
setup).

I would dare to suggest a new "model" modprobe parameter, but that's
even more above my head. I will be sure to test any changes or
suggestions, and keep at it, but I hope someone will jump in and nudge
me into the right direction.

Thanks!

Ruben
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