$ /root/cs4281_probe
probe: uid=0 euid=0
probe: no /dev/mixer* nodes exist on this guest (no snd_cs4281 attach => no family trigger surface)
probe-exit=0

$ pciconf -l | grep -i 1013 || echo ...
PCI-ABSENT: no vendor 1013 (CS4281) or 14f1 (Conexant cxm) functions
ls: /dev/mixer*: No such file or directory
ls: /dev/dsp*: No such file or directory
ls: /boot/kernel/snd_cs4281.ko -> exists (module present, no hardware to probe)