[mythtv-users] Assistance with digital audio configuration requested

Joseph Fry joe at thefrys.com
Wed Aug 21 14:35:12 UTC 2013


>> 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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