I have a Creative labs AWE64 Sound card with the sndconfig program correctly detected, however when I try to tell playmidi to send the output to the opl3 device (I know, Why would I want to do that!!) the driver does not load. If I load the module manually (modprobe opl3 io=0x388) the fm device does not show up on the list of sequencers in /dev/sndstat. I have updated to the latests compile of 2.0.36 that is on your errata page.
playmidi is broken for FM synth in 5.2; you can find updates at ftp.redhat.com:/home/notting/playmidi/. Does that solve the problem?
if this doesn't solve your porblem, please reopen this bug.