Please, untar alsa-lib-1.0.20 tar ball from www.alsa-project.org and uncomment DEBUG_MMAP in alsa-lib/src/pcm/pcm_hw.c. Compile with './configure && make' and run PA with 'LD_PRELOAD=$ALSALIB/src/.libs/libasound.so pulseaudio $ARGS' - substitute ALSALIB with alsa-lib base directory and $ARGS with your PA arguments.
Attach the log (it should contain lines like appl_forward: hw_ptr= ....
Please, untar alsa-lib-1.0.20 tar ball from www.alsa- project. org and uncomment DEBUG_MMAP in alsa-lib/ src/pcm/ pcm_hw. c. Compile with './configure && make' and run PA with 'LD_PRELOAD= $ALSALIB/ src/.libs/ libasound. so pulseaudio $ARGS' - substitute ALSALIB with alsa-lib base directory and $ARGS with your PA arguments.
Attach the log (it should contain lines like appl_forward: hw_ptr= ....