Audio Block: Sound Card not always accessible

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1

Hello Guys,

I’m facing a problem with the Audio Block on an " Generic x86_64 (legacy MBR)" Base Image,

The Problem is that often times the sound card for HDMI is not detected. We have a custom audio block where the only change is that we added this line to the pulseaudio/block.pa file:

set-card-profile 0 output:hdmi-stereo

This works fine sometimes. But often i get the following error:

audio  E: [pulseaudio] main.c: No card found by this name or index.
audio  E: [pulseaudio] main.c: Sink alsa_output.hda-intel.hdmi-stereo does not exist.

When i run cat /proc/asound/cards, this is the output:

 0 [hda-intel      ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0x4000100000 irq 147

When i run “aplay --list-pcms” to check if the sound card is detected, i can see it.

    Discard all samples (playback) or generate zero samples (capture)
default:CARD=hda-intel
    HDA Intel PCH, ALC897 Analog
    Default Audio Device
sysdefault:CARD=hda-intel
    HDA Intel PCH, ALC897 Analog
    Default Audio Device
front:CARD=hda-intel,DEV=0
    HDA Intel PCH, ALC897 Analog
    Front output / input
surround21:CARD=hda-intel,DEV=0
    HDA Intel PCH, ALC897 Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=hda-intel,DEV=0
    HDA Intel PCH, ALC897 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=hda-intel,DEV=0
    HDA Intel PCH, ALC897 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=hda-intel,DEV=0
    HDA Intel PCH, ALC897 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=hda-intel,DEV=0
    HDA Intel PCH, ALC897 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=hda-intel,DEV=0
    HDA Intel PCH, ALC897 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=hda-intel,DEV=0
    HDA Intel PCH, HDMI 0
    HDMI Audio Output
hdmi:CARD=hda-intel,DEV=1
    HDA Intel PCH, HDMI 1
    HDMI Audio Output
hdmi:CARD=hda-intel,DEV=2
    HDA Intel PCH, HDMI 2
    HDMI Audio Output
hdmi:CARD=hda-intel,DEV=3
    HDA Intel PCH, HDMI 3
    HDMI Audio Output
hdmi:CARD=hda-intel,DEV=4
    HDA Intel PCH, HDMI 4
    HDMI Audio Output

I can also play a test sound via: speaker-test -Dhdmi:CARD=hda-intel -c 6. and this works fine.

So i can’t really see the problem here. The sound card is there, the connection works, and i’m able to play a test sound. But pulseaudio just doesn’t detect the source and sink?

I would greatly appreciate any help here, this is a problem that has bugged us for ages.

Thanks you guys