Me too with Dell 9400. Amazing machine btw :P
Seeing bug #410948 I've found a workaround which seems to be working
pretty well for me. There are some variants around, but this is the one
that IMHO is less intrusive from a system point of view but needs to be
setup at each user:
===== This is only info recopilation =====
======= Credit to Daniel T Chen ======
1) see if you have the file ~/.pulse/default.pa
if not, just get a copy from:
cp /etc/pulse/default.pa ~/.pulse
2) Now, edit ~/.pulse/default.pa
goto line 55 which should be:
load-module module-udev-detect
and modify it to be
load-module module-udev-detect ignore_dB=1
3) now go a bit up and uncomment the line
#load-module module-alsa-sink
and modify it to be:
load-module module-alsa-sink control=PCM
4) stop any apps playing sound
5) kill pulseaudio (pulseaudio will respawn by itself):
killall pulseaudio
6) run alsamixer at a terminal and make sure you have Master and LFE
levels to about 50 or even 100 if you want loud range. Navigation inside
alsamixer is: left and right arrows select channel, up and down arrows
modify channel level, M mutes/unmutes a channel.
7) Move gnome sound volume slider: you'll see that now Master and LFE
are not touched and that the slider only applies to PCM channel.
8) Go rhythmbox or whatever and play your favourite songs or whatever.
Play with the gnome volume slider and see if everything is just OK.
--
[karmic] Dell Inspiron 9400 / ICH7 - Mixer controlling wrong settings
https://bugs.launchpad.net/bugs/441195
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