My knowledge of audio/alsa programming is really poor, but if someone suggest a patch I can setup the thing and do some debug.
Try Takashi 's daily snapshot tarball
you should able to get "Headphone Playback Volume" after this patch "ALSA: hda - Code consolidation for ALC88x and ALC662 auto-parsers"
using hda-emu and it seem the driver support 6 channels even when the pink and blue jacks are not retasked
Hi Raymond, thanks for your support
built and installed the daily snapshot, the driver tarball only, now the mixer applications show adjustable headphone volume level, but still hear nothing. Should upgrade alsa lib or something else too?
Just a note, in the bios there's some related option: Audio Controller: [Azalia]/Disable all Front panel Support type: AC97/[HD Audio]
I checkd both AC97 and HD with the new alsa-driver with the same result.