Searching dmesg (.txt copy) for: 
"designware", "iqaudio", "snd-rpi-iqaudio-dac", "rpivid"

Found:
[0.678763] dw_axi_dmac_platform 1f00188000.dma: DesignWare AXI DMA Controller, 
8 channels
[5.122240] rpivid 1000800000.codec: bcm2712_iommu_of_xlate: MMU 1000005100.iommu
[5.122249] rpivid 1000800000.codec: bcm2712_iommu_probe_device: MMU 
1000005100.iommu

That's all I get. No reference to "iqaudio" found.

I have two of these DACs, about of same age. They have slightly different 
printings on PCB:
PCB 003/v3 M 24 15
PCB 003/v3 M 14 16

Tested both, no luck.

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https://bugs.launchpad.net/bugs/2060240

Title:
  Pi DAC+ fails on Pi 5

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