Comment 12 for bug 502375

>> Now what I CAN'T figure out is what exactly outputs the mmap() function. Is it a library? Is it pulse? Something in the kernel? A module? I don't FREAKING KNOW, and that's driving me nuts.

The reason is alsa-pulse plugin does not support snd_pcm_mmap_* functions

http://www.alsa-project.org/alsa-doc/alsa-lib/group___p_c_m___direct.html