I use a lot of Intel D945GSEJT motherboards as thin clients. They
generally work well but by default the two MIC inputs (MIC and
FRONT_MIC) are cranked which adds a lot of white noise to the audio.
Here's my changes to turn off the MIC inputs:
1. In lts.conf add:
MIC_VOLUME=0
FRONT_MIC_VOLUME=0
2. FRONT_MIC_VOLUME isn't a standard lts.conf parameter so I added a
script in the chroot called /opt/ltsp/i386/etc/rc.d/volume which contains:
# Set up local environment
if [ -f /etc/lts.conf ]; then
eval `getltscfg -a`
fi
# Set troublesome volumes
if [ -n "$FRONT_MIC_VOLUME" ]; then
amixer -c0 sset 'Front Mic',0 ${FRONT_MIC_VOLUME}% unmute 2>/dev/null
fi
3. In the chroot run:
chkconfig volume on
To enable the script at boot.
Now the audio is nice and clean.
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