FC5 on inspiron 6400: no sound (snd_hda_intel), slow dvdrom (NEC 6650A)

[dj+fedora at delorie.com]

FYI: I haven't tested the patch therein, but I've learned this is a
known (and in theory solved) bug:

  https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=182940

> 1. I can't hear any sound.
> 
> -- sound --
> 
> My 6400 has a Sigmatel STAC9200 (snd_hda_intel) in it.  The driver
> loads fine, the utilities act as if they're making sound, nothing
> comes out of the speakers.  Yes, it's not muted (checked). Yes, the
> volume is set (77%).  Yes, the speakers work (sound is fine in WinXP).
> No, the mute/up/down Fn-Keys do nothing.  Yes, I've gone right from
> WinXP sound to reboot to FC5, didn't help.
> 
> Headphones don't work either.