Here is the output of Alsa-info script.
speakertest -c6 give sound on the Front left and Front Right.
Pulse audio only list Stereo profiles.
Motherboard specification says the chipset as ALC888B.
But Alsainfo and other commands lists it as ALC887-VD.
The Motherboard to 3 jacks in the back, one header for two jack in the front and a header for HDMI_SPDIF.
So ideally it should be 5stack-dig. But passing that option to snd_hda_intel is not helping. tried various other models like 3stack-dig, 3stack-digout, 3stack-6ch-dig, 3stack-6ch etc. also and tried restarting. But pulse audio is not recognising multi-channel neither is speakertest outputting sound in other channels.
Please help in getting multichannel working on this motherboard.