Hi I solved this bug on below: On <linux-source-3.2/sound/pci/hda/patch_realtek.c:line 2129 i added expresion: spec->multiout.no_share_stream = 1; And recompile kernel. Variable no_share_stream is defined on <hda_local.h> line 282 and isn't set. Channel front run on default but still have problems with initialize rear, side channel by device on alsa. Hard to solve this bug.