Gateway MP-6954 laptop, FC6, no sound

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I've been running FC6 on a Gateway MP-6954 laptop computer
since Oct-2006, and have been hoping that the regular FC6 yum
updates will eventually provide an alsa update that will support
the MP-6954's sound hardware.  So far, that hasn't happened,
and my system has never had sound capability.

Current system stuff:

uname -r
2.6.20-1.2962.fc6

rpm -q -a | grep -i alsa
alsa-lib-1.0.14-0.1.rc1.fc6
alsa-lib-devel-1.0.14-0.1.rc1.fc6
alsa-utils-1.0.14-0.2.rc1.fc6

cat /etc/modprobe.conf
alias eth0 sky2
alias scsi_hostadapter ahci
remove snd-hda-intel { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ; };
    /sbin/modprobe -r --ignore-remove snd-hda-intel
options snd cards_limit=8
alias snd-card-0 snd-hda-intel
options snd-hda-intel index=0
alias snd-card-7 snd-usb-audio
options snd-usb-audio index=7

alsamixer (v1.0.14rc1) reports:
 Card: HDA Intel
 Chip: SigmaTel ID 7634

Some Internet googling showed that Tobin Davis released
a source level Sigmatel STAC9250 (7634) test patch 6
(gateway-mp6954.patch.6) that appears to address this
problem back in December 2006.

  http://www.spinics.net/lists/alsa-devel/msg05113.html

Is this gateway-mp6954.patch.6 still appropriate to be 
used on my FC6 system? (My FC6 sys has all the current
yum updates applied.)

If this patch is appropriate, should I first remove the
existing alsa rpms before installing alsa from source
with the patch.  I.e. should I remove all 3 packages:

 alsa-lib-1.0.14-0.1.rc1.fc6
 alsa-lib-devel-1.0.14-0.1.rc1.fc6
 alsa-utils-1.0.14-0.2.rc1.fc6

Will subsequent FC6 yum updates involving alsa then
disturb the patched alsa?

Thanks much,
Bill
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