Gentoo Archives: gentoo-user

From: Arve Barsnes <arve.barsnes@×××××.com>
To: Gentoo <gentoo-user@l.g.o>
Subject: Re: [gentoo-user] Audio through second HDMI output on GPU?
Date: Fri, 21 May 2021 22:11:14
Message-Id: CAJjrzcWL3oSd66FTFHa=MKZb73ZYs9vJWcsbi-GZzY+xHcaNKg@mail.gmail.com
In Reply to: Re: [gentoo-user] Audio through second HDMI output on GPU? by Mark Knecht
1 On Fri, 21 May 2021 at 22:47, Mark Knecht <markknecht@×××××.com> wrote:
2 > On Thu, May 20, 2021 at 2:35 AM Arve Barsnes <arve.barsnes@×××××.com> wrote:
3 > > Resending this message, as the last time it was derailed by a question
4 > > about DE and pulseaudio, neither of which are relevant to this
5 > > low-level problem (and also not installed anyway, as I run a simple
6 > > openbox WM with alsa only).
7 > I'm very sorry that when you asked this question a month ago you didn't like my answer. It was never my intention to 'derail' your question with DE or pulseaudio. That said no one else has answered that question nor have they responded to this one that you posted yesterday. I think you are in a fairly unique setup that most people don't deal with but it is an interesting area. I'd still like to help if I can.
8
9 Maybe derailed was a little harsh. I was appreciative of your answer
10 either way, as I might have left out some necessary information to
11 make you ask about those things. This is still very low level as far
12 as I understand it, so I'm not completely sure how to ask about what
13 I'm wondering :)
14
15 >
16 > To start please run the following command and let's see what ALSA tells us:
17 >
18 > cat /proc/asound/card*/eld#0.*
19
20 There was 16 of these entries, /proc/asound/card1/eld#0.4 was my Acer
21 monitor which I managed to get sound through with my command:
22 aplay -D plughw:1,7 sample.wav
23
24 Most of the others simply showed:
25 monitor_present 0
26 eld_valid 0
27
28 The connected TV was here:
29 # cat /proc/asound/card1/eld#0.0
30 monitor_present 1
31 eld_valid 1
32 monitor_name TOSHIBA-TV
33
34 connection_type HDMI
35 eld_version [0x2] CEA-861D or below
36 edid_version [0x3] CEA-861-B, C or D
37 manufacture_id 0x6252
38 product_id 0x108
39 port_id 0x400
40 support_hdcp 0
41 support_ai 0
42 audio_sync_delay 62
43 speakers [0xffff] FL/FR LFE FC RL/RR RC FLC/FRC RLC/RRC
44 FLW/FRW FLH/FRH TC FCH
45 sad_count 2
46 sad0_coding_type [0x1] LPCM
47 sad0_channels 2
48 sad0_rates [0xe0] 32000 44100 48000
49 sad0_bits [0xe0000] 16 20 24
50 sad1_coding_type [0x2] AC-3
51 sad1_channels 6
52 sad1_rates [0xe0] 32000 44100 48000
53 sad1_max_bitrate 640000
54
55 All of this is quite cryptic to me, so if you can glean any useful
56 information from it that would be great. The monitor output is fairly
57 similar if you exclude the sad1*-lines at the end, the most prominent
58 difference being the speakers line, which only listed '[0x1] FL/FR'
59
60 Regards,
61 Arve

Replies

Subject Author
Re: [gentoo-user] Audio through second HDMI output on GPU? eric <eriic1@×××.net>
Re: [gentoo-user] Audio through second HDMI output on GPU? Mark Knecht <markknecht@×××××.com>