From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anssi Hannula <anssi.hannula@iki.fi>
Subject: Re: ANNOUNCE: NVIDIA HDMI audio documentation
Date: Sat, 05 Feb 2011 22:05:15 +0200
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To: Stephen Warren <swarren@nvidia.com>
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On 04.02.2011 00:37, Stephen Warren wrote:
> I have written a document re: how to understand and trouble-shoot issues
> with audio-over-HDMI on NVIDIA GPUs. It's available at:
> =

> ftp://download.nvidia.com/XFree86/gpu-hdmi-audio-document/gpu-hdmi-audio.=
html
> =

> The intent is to provide all the support information I've given various
> people on support forums in a centralized place.
> =

> Hope this helps!

A nice document, thanks :)

A couple of comments:

> Early chipsets (ION an earlier) do not support PD or ELD information. In
> this case, the ALSA driver assumes that a monitor is always attached,
> and supports "basic audio=94 (stereo 16-bit PCM only).

The ALSA driver actually assumes that the monitor supports everything.

> 10.3. Under-Enumeration of Logical Devices

This section misses one patch:
http://git.alsa-project.org/?p=3Dalsa-lib.git;a=3Dcommitdiff;h=3De6d5dcf1f6=
25984605d362338d71162de45a6c60

> 12.4. Verify Your ELD Is Valid

This section has "44100 48000 88200" multiple times. Maybe one should
mention that those are currently shown incorrectly (as per "[alsa-devel]
HDA - hdmi_show_short_audio_desc puts wrong rates in eld#N"). Maybe also
in chapter 10, though it is a very minor issue (it just affects the
display, not the actual used values).

-- =

Anssi Hannula