ESP1010 sound card from ESI: some analog inputs are not working

[pbat0908]

Hello and thanks for the great mudita24 stuff :)

I am using it with an (old) ESP1010 sound card from ESI on Xubuntu 20.04. Everything works fine except the analog inputs 1 and 2, as well as the 2 MIC inputs.

I am sure this is not a hardware problem of the sound card because I ran it with a Windows XP inside a Virtualbox instance (on the same host) and all analog inputs are fully usable.

Is there any specific configuration for this sound card ?
Thanks,
Patrick