Nouveau - Sep 2014 - [Bug 72717] [NVE6] No sound via display port (hdmi works)

https://bugs.freedesktop.org/show_bug.cgi?id=72717

          Priority: medium
            Bug ID: 72717
          Assignee: nouveau at lists.freedesktop.org
           Summary: No sound via display port (hdmi works)
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: matthias.h.nagel at gmail.com
          Hardware: Other
            Status: NEW
           Version: 7.4 (2008.09)
         Component: Driver/nouveau
           Product: xorg

Created attachment 90786
  --> https://bugs.freedesktop.org/attachment.cgi?id=90786&action=edit
Kernel log with monitor attached to display port

I own an ASUS Nvidia GTX 660 card. If I connect a monitor to the HDMI
connector, sound works. If I connect a monitor to the display port connector,
sound does not work. In the latter case, all /proc/asound/NVidia/eld* show the
output

monitor_present         0
eld_valid               0

If I connect a monitor to the HDMI port, "monitor_present" shows
"1".

Kernel: 3.12.5 (Gentoo)
Dmesg for the display port case (failure case): See attachment

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https://bugs.freedesktop.org/show_bug.cgi?id=72717

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|No sound via display port   |[NVE6] No sound via display
                   |(hdmi works)                |port (hdmi works)

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Probably missing some initialization. Can you boot with
'nouveau.debug=debug'
(which turns on all nv_debug messages) -- there's some stuff in DP init that
might make sense to someone. [Unfortunately I know very little about DP.]

If you'd like to push this further yourself, you could make an mmiotrace of
the
blob of a unplug/plug sequence, that might give someone some hints. See
https://wiki.ubuntu.com/X/MMIOTracing for some hints as to how to start.

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--- Comment #2 from Ben Skeggs <skeggsb at gmail.com> ---
It's not expected to work actually.  Nobody as of yet has cared at all, and
I
totally forgot about it, personally.

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
There appear to be some patches for it headed for linux-3.18. You can give

http://cgit.freedesktop.org/nouveau/linux-2.6/log/?h=linux-3.18

a whirl and see if that makes it work.

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How does patch reviewing work for things like this? It seems kind of like
eldritch incantations.... Are there docs that explain what these mean or
does this come from replaying register writes from the blob?

~ Patrick

On Mon, Sep 15, 2014 at 12:23 PM, <bugzilla-daemon at freedesktop.org>
wrote:
>   *Comment # 3
<https://bugs.freedesktop.org/show_bug.cgi?id=72717#c3> on
> bug 72717 <https://bugs.freedesktop.org/show_bug.cgi?id=72717> from
Ilia
> Mirkin <imirkin at alum.mit.edu> *
>
> There appear to be some patches for it headed for linux-3.18. You can give
> http://cgit.freedesktop.org/nouveau/linux-2.6/log/?h=linux-3.18
>
> a whirl and see if that makes it work.
>
>  ------------------------------
> You are receiving this mail because:
>
>    - You are the assignee for the bug.
>
>
> _______________________________________________
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> Nouveau at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/nouveau
>
>
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--- Comment #4 from Patrick Baggett <baggett.patrick at gmail.com> ---
How does patch reviewing work for things like this? It seems kind of like
eldritch incantations.... Are there docs that explain what these mean or
does this come from replaying register writes from the blob?

~ Patrick

On Mon, Sep 15, 2014 at 12:23 PM, <bugzilla-daemon at freedesktop.org>
wrote:
>   *Comment # 3
<https://bugs.freedesktop.org/show_bug.cgi?id=72717#c3> on
> bug 72717 <https://bugs.freedesktop.org/show_bug.cgi?id=72717> from
Ilia
> Mirkin <imirkin at alum.mit.edu> *
>
> There appear to be some patches for it headed for linux-3.18. You can give
> http://cgit.freedesktop.org/nouveau/linux-2.6/log/?h=linux-3.18
>
> a whirl and see if that makes it work.
>
>  ------------------------------
> You are receiving this mail because:
>
>    - You are the assignee for the bug.
>
>
> _______________________________________________
> Nouveau mailing list
> Nouveau at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/nouveau
>
>
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--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #4)
> Are there docs that explain what these mean or
Of course (I hope!). But they're internal to NVIDIA and they have no real
interest in sharing. Sometimes things can be found out from occasoinal code
drops, e.g. the more recent gk20a android driver. (Of course that HW has no
display component, so no use for something like this.)
> does this come from replaying register writes from the blob?
Seeing what the blob does + manual poking based on observed patterns.

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On Mon, Sep 15, 2014 at 2:17 PM, <bugzilla-daemon at freedesktop.org>
wrote:
>   *Comment # 5
<https://bugs.freedesktop.org/show_bug.cgi?id=72717#c5> on
> bug 72717 <https://bugs.freedesktop.org/show_bug.cgi?id=72717> from
Ilia
> Mirkin <imirkin at alum.mit.edu> *
>
> (In reply to comment #4
<https://bugs.freedesktop.org/show_bug.cgi?id=72717#c4>)> Are there
docs that explain what these mean or
>
> Of course (I hope!). But they're internal to NVIDIA and they have no
real
> interest in sharing.
>
> Hah. In other words, no. :|
Oh well, keep up the awesome work guys!
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--- Comment #6 from Patrick Baggett <baggett.patrick at gmail.com> ---
On Mon, Sep 15, 2014 at 2:17 PM, <bugzilla-daemon at freedesktop.org>
wrote:
>   *Comment # 5
<https://bugs.freedesktop.org/show_bug.cgi?id=72717#c5> on
> bug 72717 <https://bugs.freedesktop.org/show_bug.cgi?id=72717> from
Ilia
> Mirkin <imirkin at alum.mit.edu> *
>
> (In reply to comment #4
<https://bugs.freedesktop.org/show_bug.cgi?id=72717#c4>)> Are there
docs that explain what these mean or
>
> Of course (I hope!). But they're internal to NVIDIA and they have no
real
> interest in sharing.
>
> Hah. In other words, no. :|
Oh well, keep up the awesome work guys!

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Ilia Mirkin <imirkin at alum.mit.edu> ---
DP audio should work starting with kernel 3.18. Feel free to reopen if it still
doesn't.

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--- Comment #8 from Matthias Nagel <matthias.h.nagel at gmail.com> ---
Thanks, it works on kernel 4.0.5-gentoo. :-D

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