[LAU] jackd capture problem

Hello List, I'm trying to use rakarrack, and in the process I found that it gets no input from line-in. (I use qjackctl to make the appropriate connections.) It's probably not a mixer problem, because I do hear what's coming in, it just doesn't seem to enter jackd's world. This is further confirmed by connecting jackmeter (http://www.ecs.soton.ac.uk/~njh/jackmeter) to alsa_pcm/capture_1 and seeing no signals. The soundcard is an old SB-something (lspci says: Multimedia audio controller: Ensoniq 5880 AudioPCI (rev 02)), and I didn't have this problem with it in an older, Fedora 5 machine. The one I'm using now is Fedora 7, qjackctl 0.2.20. Any idea on what to check or try would be appreciated! Andras