I believe the TV tuner chip is the newest BrookTree ones, and i would try compiling the latest bbtv software, google bbtv.
I wish i could help more but hey, i have only a 5660 but i am considering a USB TV tuner but...not sure on linux tho.
LR-s Install guide will be there but not right now. This is the distro i actually want to run native and only. I run debian now to be able to backtrace every single problems and clues. Making the config there then recompiling it all.
Anyhow, iso images of a debian based mini distro optimized for 566X and 888X are on the way, 5660 are first. Damn i wish i had a 888X
Hope that helps.