Yamaha sound-problems

[audio07]

HI!

I've got a problem running my Yamaha DS-XG YMF754 on Gentoo. Well actually that means, I had it already running but it stopped and I don't know why
Ok step by step: the soundcard worked properly until today. I booted Linux and then I had the problem, that every file in XMMS gets only played 3 seconds and the it always stopps. Opening a mp3-stream leads to something like an infinite loop - at least it leads to a 100%-load. Xine + mplayer (video) for example work - with sound! So I had a closer look to the volume control of gnome, which showed another device added: "SigmaTel STAC9708/11 OSS MIXER". Maybe that intereferes in any way with my soundcard.

As already mentioned: I don't know exactly, what's the problem, as I didn't change anything (ok at least I didn't have this intention). All I did meanwhile is emerging some packages (k3b and biological stuff). And I had a closer look at "Multimedia Systems Selector". (ALSA is activated there, but alsasink doesn't work).

Any hints? Hope my description is useful....

System:
Athlon XP 1800+
Kernel 2.6.11.10 (self compiled) [ALSA is compiled into the kernel]

gnome 2.8.3

make.conf:
CFLAGS="-O2 -march=athlon-xp -fomit-frame-pointer"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"