x1g7 has "4 x 360-degree far-field microphones" which apparently require DSP support to be of any use. From Linux kernel bug 201251: > The only way to enable DMIC support with HDA is to enable the DSP support. > If you use the legacy HDaudio driver you will not be able to access the DSP. https://bugzilla.kernel.org/show_bug.cgi?id=201251