[gentoo-user] Sound stopped working (xfce4 problem?)

[Grant]

Hello,

Sound stopped working at some point on my laptop.  I don't use the
sound very much so it's hard to say what caused it, but now I need to
start use a SIP phone so I need the sound.  I've double-checked
everything mentioned here:

http://www.gentoo.org/doc/en/alsa-guide.xml

but I can't find anything that indicates anything is wrong, other than
the lack of sound.  The only strange thing is nothing happens when I
click on the Settings -> Mixer Settings icon in xfce4 except the
system seems to revert to an older version of GTK or something and X
gets pretty unstable.  Very strange.  This icon is different than the
xfce4-panel volume icon.  That icon works fine.

Can anyone suggest anything to try?

- Grant
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