Recompiled -47 with CONFIG_EFI_CUSTOM_SSDT_OVERLAYS=n and the device
works correctly as before.

I do not know if this is a kernel or firmware bug. Will try the upstream
kernel to see if anything is different.

** Summary changed:

- HDMI video capture device fails [534d:2109] (no /dev/video{0,1})
+ CONFIG_EFI_CUSTOM_SSDT_OVERLAYS causes HDMI video capture device to fail 
[534d:2109] (no /dev/video{0,1})

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https://bugs.launchpad.net/bugs/1894424

Title:
  CONFIG_EFI_CUSTOM_SSDT_OVERLAYS causes HDMI video capture device to
  fail [534d:2109] (no /dev/video{0,1})

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