Similar results on the 3A+ under the KMS overlay (with cma-128 to ensure
it boots, re LP: #2060300); except here ffmpeg results in:

    [alsa @ 0xaaaad948a930] ALSA buffer xrun
    [alsa @ 0xaaaad948a930] ALSA write error: Cannot allocate memory
    [aost#0:0/pcm_s16le @ 0xaaaad94c5a30] Error submitting a packet to the 
muxer: Input/output error
    [out#0/alsa @ 0xaaaad94a5070] Error muxing a packet

And the following appears in dmesg:

    [  118.466695] vc4_hdmi 3f902000.hdmi: ASoC: error at soc_component_trigger 
on 3f902000.hdmi: -12
    [  118.468527] vc4_hdmi 3f902000.hdmi: ASoC: error at soc_component_trigger 
on 3f902000.hdmi: -12

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https://bugs.launchpad.net/bugs/2038924

Title:
  No alsa sound cards on Pi 5

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