Here's a weird Fedora 9 problem (was ok with 8). At first I thought it was that all the sound was coming from my left speaker, and nothing was coming from the right speaker. (And the speakers are fine. They are 2.0 speakers, plugged in with a 3.5mm connector.) But after some time, I discovered something weirder than that. The right speaker isn't silent. Some low-pitched sound comes from it! I suspect what is happening is that the left channel gets routed to the left speaker, as it should be, but that somehow the sound driver is routing the .1 bass to the right speaker, and dropping the right channel, instead of mixing the .1 bass into the signal for both speakers.
How do I fix these kinds of routings?
The sound card is:
00:1f.5 Multimedia audio controller: Intel Corporation 82801BA/BAM AC'97 Audio Controller (rev 12)