[alsa-devel] 5.1 sound system works as 2.0 on all kernels newer than 3.2.21

Hi, my 5.1 sound system works as 2.0 on all kernels newer than 3.2.21. Control "Channel Mode" is missing in "Alsamixer". I use the option "3stack-6ch" (module snd-hda-intel, Realtetsk codec ALC882) for kernel 3.2.21.

"Alsa-info" for kernels 3.2.21 and 3.13.6 attached.