Tak apgrejduj, k dispozici je prinejmensim 5.4 (to mam ja), v upstreamu se mozna najde jeste neco vyssiho v nightly buildu.
BTW, kdybys pet minut googlil: https://forums.linuxmint.com/viewtopic.php?t=343567 rika "...you had been booting only with your permanent installation kernel 4.15, which doesn't have the device-driver patch code. Then you booted from a LiveUSB that has kernel 5.4, which may have the patch".