Fingerprint scanner support in Linux is abysmal. It’s so bad, Dell’s Linux line (anemic, but at least they try… half-heartedly) just stopped including the hardware.
I’ve always chalked it up to proprietary shenanigans, like the Broadcom fuckers (fuck you, Broadcom[1]).
BTW, Broadcom: may you rot in hell; you’re on my “perpetual ban” list. I hate you so much, I’ll write companies that use your chips just to tell them I’m not buying their product just because they use a Broadcom chip.