According to the alsa-info.txt of #6 and #7, there is no speaker at all on the 3 sound cards, if you mean there is indeed speaker on one of the sound cards, that should be a problem of kernel driver.
So could you please install the ubuntu 18.04 (bionoic beaver) and test if it has the same behaviour with the issue stated in this bug?
@Flavien,
According to the alsa-info.txt of #6 and #7, there is no speaker at all on the 3 sound cards, if you mean there is indeed speaker on one of the sound cards, that should be a problem of kernel driver.
So could you please install the ubuntu 18.04 (bionoic beaver) and test if it has the same behaviour with the issue stated in this bug?