[Bug 55556] [965GM SDVO HDMI regression] no video on external monitor without audio

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55556

--- Comment #15 from Takashi Iwai <tiwai at suse.de> ---
Hmm.... It's obviously a change only to HD-audio codec, and I see no link how
it affects the video output.

Maybe the SVDO HDMI is enabled only when the audio codec's pin is turned on by
some reason?  The recent HD-audio HDMI driver sets the audio pin only when
used.

If this is the case, try the following:

- get hda-verb program (described in Documentation/sound/alsa/HD-Audio.txt)

- build the kernel with CONFIG_SND_HDA_HWDEP=y

- check the codec number of HDMI codecs; you can find
/proc/asound/card*/codec#* files, and one of them must contain "HDMI" codec
name.  The number after '#' is the codec address.

- Check "Pin" widget nodes.  The codec#* proc file contains the list of
widgets, and some of them must be pin widgets, e.g. 0x03.

- Run the command to each pin widget like below:
   hda-verb /dev/snd/hwC0D3 0x03 SET_PIN_WID 0x40

  where /dev/snd/hwC0D3 is the hwdep device corresponding to card0/codec#3.
  The second argument (0x03) is the pin widget NID to apply.

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