Under Myhthbuntu I recent;ly installed the tbs-6820 and installed the drivers and firmware and got it working. I later installed the KDE4 desktop. I cannot be sure of the exact sequence but now my test program (kaffeine) cannot 'see' the tuners. Checking dmesg has given mixed results. Now, even if I redo the driver installation process, the results do not show up in dmesg.
It occurs to me that this may be link problem. If I knew the names of which files and where they should be, I might be able to resolve the problem myself.