On an MSI GX660R laptop and on both Fedora 15 and Ubuntu (including 11.10 so far), the audio only comes out of the subwoofer - resulting in crackly sound at any sort of high pitch and a really quiet maximum volume. This is not due to any settings available in Sound Preferences.
The problem can actually be fixed, by adding
#Fix for Intel (ICH9 Family) HD Audio Controller with Realtek ALC1200 on MSI GT725
options snd-hda-intel model=targa-dig
# targa-dig Targa/MSI
# targa-2ch-dig Targa/MSI with 2-channel
# targa-8ch-dig Targa/MSI with 8-channel (MSI GX620)
options snd slots=snd-hda-intel
alias snd-card-0 snd-hda-intel
This fix, however, has two issues. The first is that headphones no longer work, nor any of the two other sound-output ports (except HDMI, but that's hardly the same). The second is that the fix actually breaks itself after one or two (varies) reboots, after which the sound stops working out of any speaker (including the subwoofer). The only way to fix this is to remove the fix, reboot, then add it again and reboot again.
As it says in the fix's comments, it is actually designed for the MSI GT725, on which those problems may not occur. But either way, if someone could offer some advice on how to make the fix permanent on my laptop and also allow me to use headphones, it would be much appreciated!
Thanks in advance