With alsa-driver-linuxant, pulseaudio doesn't connect to sound card

I have a ThinkPad X61 which has a HDA sound card and so-called ThinkPad 
56K Modem 
<http://www.thinkwiki.org/wiki/ThinkPad_56K_Modem_%28MDC-1.5%29> 
daughter card.  The latter's ID is 14F1:2BFA.  The modem including fax 
functionality works fine with the (full) alsa-driver-linuxant and 
hsfmodem drivers built for the latest Ubuntu Linux kernel 
(linux-image-generic-pae 2.6.31.14.27) from these debs:

alsa-driver-linuxant_1.0.20.3_all.deb
hsfmodem_7.80.02.05full_i386.deb


Unfortunately, with these drivers, pulseaudio doesn't connect to the 
sound card, so there is no audio... except of course when using the 
modem in which case one can hear the phone line.  With original ALSA 
drivers sound worked fine.

Any suggestions?  What additional information should I provide?
-- 
Thomas Hood