sudo lsmod | sed -ne '1p; /bt/p'

Module                  Size  Used by
btusb                  81920  0
btrtl                  28672  1 btusb
btbcm                  24576  1 btusb
btintel                53248  1 btusb
btmtk                  12288  1 btusb
bluetooth            1089536  32 btrtl,btmtk,btintel,btbcm,bnep,btusb,rfcomm
dell_rbtn              20480  1
rfkill                 40960  10 iwlmvm,nfc,bluetooth,dell_laptop,dell_rbtn,cfg80211