[alsa-devel] ANNOUNCE: NVIDIA HDMI audio documentation
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!
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” (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=alsa-lib.git;a=commitdiff;h=e6d5dcf1f62598460...
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 wrote:
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
A nice document, thanks :)
A couple of comments:
Thanks very much for the feedback.
...
12.4. Verify Your ELD Is Valid
This section has "44100 48000 88200" multiple times.
I'm having trouble finding this. Can you quote a bit more text to highlight exactly where/what the problem is?
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").
Am I correct that this isn't patched yet? I couldn't see anything that touched this in the git log, nor any following to this email:
http://mailman.alsa-project.org/pipermail/alsa-devel/2011-January/035557.htm...
Thanks again.
-- nvpublic
On 07.02.2011 19:39, Stephen Warren wrote:
Anssi Hannula wrote:
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
A nice document, thanks :)
A couple of comments:
Thanks very much for the feedback.
...
12.4. Verify Your ELD Is Valid
This section has "44100 48000 88200" multiple times.
I'm having trouble finding this. Can you quote a bit more text to highlight exactly where/what the problem is?
The examples have:
sad0_rates [0xe0] 44100 48000 88200 HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 88200, bits = 16 20
While you are not claiming they are correct, it would probably be best to mention that in the text (and/or in the issues chapter).
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").
Am I correct that this isn't patched yet? I couldn't see anything that touched this in the git log, nor any following to this email:
http://mailman.alsa-project.org/pipermail/alsa-devel/2011-January/035557.htm...
Yes, the issue is not yet fixed.
I planned to provide a patch but I haven't had the time to do it yet after all.
Thanks again.
Anssi Hannula wrote at Monday, February 07, 2011 1:49 PM:
On 07.02.2011 19:39, Stephen Warren wrote:
Anssi Hannula wrote:
On 04.02.2011 00:37, Stephen Warren wrote: ...
12.4. Verify Your ELD Is Valid
This section has "44100 48000 88200" multiple times.
I'm having trouble finding this. Can you quote a bit more text to highlight exactly where/what the problem is?
The examples have:
sad0_rates [0xe0] 44100 48000 88200 HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 88200, bits = 16 20
Ah! Now that I read this again, I see what you mean:
I thought you mean the text was incorrectly duplicated. You were in fact simply pointing out the fact that the text you quoted (which happens to appear a couple of times) was wrong due to the issue with rate printing.
Thanks.
participants (2)
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Anssi Hannula -
Stephen Warren