I kind of expected the A485 to have similar issues to the T480, since it's the same laptop except for the cpu and graphics. I did some preliminary searching and the listing of the laptop as "ubuntu certified" gave me too much confidence, I guess.
I forgot to mention in the parent post that the SD card reader can't detect insertion/removal at times, yeah, so I have a script to reload the rtsx_pci_sdmmc kernel module to force it to recheck.