This also happens to me. I had 9.10 and initially had the problem but an
update fixed this problem. I'm not sure what update it was.
I now upgraded to 10.04 and the problem is back. I have to use a script
I found to mute the speakers manually every time I plug my headphones
in. Installing gnome-alsamixer does not work for me as I don't have a
'headphone jack sense' option with my sound card. Script to turn off
speakers is below.
#/bin/bash
if [ $(~/bin/hda-verb /dev/snd/hwC0D0 0x1f GET_PIN_WIDGET_CONTROL 0x0 | grep
0x0 | wc -l) = 1 ];then ~/bin/hda-verb /dev/snd/hwC0D0 0x1f
SET_PIN_WIDGET_CONTROL 0x40;
echo 'unmuted';
else
~/bin/hda-verb /dev/snd/hwC0D0 0x1f SET_PIN_WIDGET_CONTROL 0x0;
echo "Speakers muted";
fi
--
Compaq nx6110 needs an alsactl init entry to unmute Headphone Jack Sense
https://bugs.launchpad.net/bugs/585777
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