[LAU] Tearing my hair out with HDMI on recent Ubuntu/KXStudio

This is with:

james@audio:~$ uname -a
Linux audio 4.2.0-22-lowlatency #27-Ubuntu SMP PREEMPT Fri Dec 18
00:06:48 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

This was Ubuntu Studio 15.10, with pulse removed and KXStudio packages
added.

I have an AMD APU, and its connected to a HDMI processor (actually an
Audiolab 8200AP).

james@audio:~$ lspci | grep -i audio
00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] BeaverCreek
HDMI Audio [Radeon HD 6500D and 6400G-6600G series]
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD] FCH Azalia
Controller (rev 01)
05:04.0 Multimedia audio controller: C-Media Electronics Inc CMI8788
[Oxygen HD Audio]

So, we have the audio device. But ALSA does not seem to see it.

alsamixer shows:

Card: HD-Audio Generic F1: Help │
│ Chip: ATI R6xx HDMI F2: System information │
│ View: F3:[Playback] F4: Capture F5: All F6: Select sound card │
│ Item: S/PDIF

ie just a runt SPDIF, no PCMs.

I think I've turned radeon audio on appropriately:

james@audio:/etc/modprobe.d$ pwd
/etc/modprobe.d
james@audio:/etc/modprobe.d$ cat radeon.conf
options radeon audio=1

In dmesg I see this:

[ 16.142396] snd_hda_codec_hdmi hdaudioC1D0: HDMI ATI/AMD: no speaker
allocation for ELD
[ 16.442623] snd_hda_codec_hdmi hdaudioC1D0: HDMI ATI/AMD: no speaker
allocation for ELD
[ 16.742857] snd_hda_codec_hdmi hdaudioC1D0: HDMI ATI/AMD: no speaker
allocation for ELD
[ 17.043068] snd_hda_codec_hdmi hdaudioC1D0: HDMI ATI/AMD: no speaker
allocation for ELD
[ 17.343309] snd_hda_codec_hdmi hdaudioC1D0: HDMI ATI/AMD: no speaker
allocation for ELD
[ 17.643529] snd_hda_codec_hdmi hdaudioC1D0: HDMI ATI/AMD: no speaker
allocation for ELD
[ 17.943756] snd_hda_codec_hdmi hdaudioC1D0: HDMI ATI/AMD: no speaker
allocation for ELD
[ 18.243984] snd_hda_codec_hdmi hdaudioC1D0: HDMI ATI/AMD: no speaker
allocation for ELD

I have rebooted, and restarted the Audiolab since I plugged in the HDMI
cable.

And the ELD info seems sane:

james@audio:/proc$ cat ./asound/card1/eld#0.0
monitor_present 1
eld_valid 1
monitor_name
connection_type HDMI
eld_version [0x2] CEA-861D or below
edid_version [0x0] no CEA EDID Timing Extension block present
manufacture_id 0x0
product_id 0x0
port_id 0x0
support_hdcp 0
support_ai 0
audio_sync_delay 0
speakers [0x4f] FL/FR LFE FC RL/RR RLC/RRC
sad_count 1
sad0_coding_type [0x1] LPCM
sad0_channels 8
sad0_rates [0x6e0] 32000 44100 48000 88200 96000
sad0_bits [0xe0000] 16 20 24
james@audio:/proc$

Any idea how to tell what's going on - ?

The slight weirdness is that the system is connected to the Audiolab
over HDMI, but I don't have an HDMI monitor - and in fact I access the
system via putty or XRDP.

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Received on Thu Dec 31 00:15:02 2015