I don't think the bug is only VLC. Since I upgraded to Ubuntu 9.04 amd64,  all 
PulseAudio applications don't use subwoofer anymore.
PulseAudio is configured 6 channel mode, and the order is checked OK by a 
successful speaker-test : I can hear sound in each speaker at the right time, 
and subwoofer is OK. PulseAuydio volume meters are showing meters moving 
synchronously with speaker-test, so it is OK.
BUT : VLC Pulse, Audacious with PulseAudio plugin, ogmtools, mpg123, etc... 
don't use subwoofer any more when playing stereo. PulseAudio volumemeters are 
confirming that subwoofer is the only one to remain silent.

So it appears to be more a pulseaudio bug : it stopped to mix right and
left channels into subwoofer/lfe channel when a siource with no explicit
subwoofer/lfe channel is playing.

-- 
VLC Pulse Audio 5.1 Patch
https://bugs.launchpad.net/bugs/360283
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