[mythtv-users] Assistance with digital audio configuration requested

[Daryl McDonald]

On Wed, Aug 21, 2013 at 10:35 AM, Joseph Fry <joe at thefrys.com> wrote:

> >> Perhaps someone can say for certain if the ATI binary drivers are
> >> required for audio over HDMI... I would suspect that they might if you
> >> see no trace of the audio device on your system.
> >>
> >> One thing you might do is open a terminal and run "dmesg".  this will
> >> give you the log generated by the kernel as it detects and configures
> >> drivers for your system.  Scan through it to see if you see any sign
> >> that it loaded drivers for ATI audio, HDMI audio, or something like
> >> that.
> >>
> >> You might also do an "lspci" and take a look at the output of that to
> >> see if the device was even detected.
> >>
> >> There are a ton of tools at your disposal to check things out, however
> >> without any experience with your device I can't be sure what the best
> >> approach would be.  Perhaps someone else can help?
> >>
> >> Personally, I always use the binary drivers from ATI or NVIDIA.  While
> >> the ATI/AMD drivers are not perfect by any means, they are superior to
> >> the open source drivers included in Ubuntu, simply because they have
> >> access to information about the hardware that is not provided to open
> >> source developers.
> >>
> >> You do run the risk of X not starting, however typically this is
> >> easily fixed, and I don't see it happen very frequently, way too many
> >> users of those drivers for major issues like that to be ignored.  Just
> >> make sure your system is fully updated before adding the video
> >> drivers... just in case your previous bad experience required a patch.
>
> >
> > 00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia
> > (Intel HDA)
> > 01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cedar HDMI
> Audio
> > [Radeon HD 5400/6300 Series]
> >
> > Above are the only two lines detailing "Audio" from "lspci".
> >
> > 14.977248] input: HD-Audio Generic HDMI/DP,pcm=3 as
> > /devices/pci0000:00/0000:00:02.0/0000:01:00.1/sound/card1/input10
> >
> > 14.594360] [drm] Radeon Display Connectors
> > [   14.594361] [drm] Connector 0:
> > [   14.594363] [drm]   HDMI-A-1
> > [   14.594363] [drm]   HPD2
> > [   14.594365] [drm]   DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448
> 0x644c
> > 0x644c
> > [   14.594366] [drm]   Encoders:
> > [   14.594367] [drm]     DFP1: INTERNAL_UNIPHY1
> > [   14.594368] [drm] Connector 1:
> > [   14.594369] [drm]   DVI-D-1
> > [   14.594370] [drm]   HPD4
> > [   14.594371] [drm]   DDC: 0x6460 0x6460 0x6464 0x6464 0x6468 0x6468
> 0x646c
> > 0x646c
> > [   14.594372] [drm]   Encoders:
> > [   14.594373] [drm]     DFP2: INTERNAL_UNIPHY
> > [   14.594373] [drm] Connector 2:
> > [   14.594374] [drm]   VGA-1
> > [   14.594376] [drm]   DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438
> 0x643c
> > 0x643c
> > [   14.594376] [drm]   Encoders:
> > [   14.594377] [drm]     CRT1: INTERNAL_KLDSCP_DAC1
> >
> > Above is what seems relevant from "dmesg"
> >
> > ATI/AMD proprietary FGLRX graphics driver (post-updates release) is the
> > option from "System Settings>additional drivers" is what I leaning
> toward.
> > What do you think?
>
> I wouldn't hesitate to use the FGLRX driver... but if your wary of
> doing it, it may not be necessary.
>
> I found several posts from folks who suggest that support for HDMI
> audio in the open source drivers is experimental (in Ubuntu 12.10
> anyway) and in order to use it you need to enable it like so:
> ---
> In a terminal run "gksu gedit /etc/default/grub" and add the
> "radeon.audio=1" parameter to GRUB_CMDLINE_LINUX_DEFAULT so it looks
> something like this:
>
>     GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.audio=1"
>
> Save the file and run "sudo update-grub."
>
> Reboot.
> ---
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>

Well I took the plunge and installed the FGLRX driver, rebooted and still
have a picture, and even a HDMI option in sound settings, but no sound with
or without the patch cord. Initially doing the sound test in HDMI was
successful, I heard "front right" and "front left". Playing a recording is
however mute. Now when I go back into sound settings, none of the options
give an audible test, but with the digital option I can see the speakers
turn blue when I test either one, but no sound. What can I do now to
recover sound?

Daryl
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