Sound - no HDMI output

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http://askubuntu.com – Sound problem, no HDMI output Hi all, Ubuntu 12.04 desktop 64bit ASUS mobo M5A97R2.0 audio Realtek ALC887 I have been struggling more than a week unable solving the sound problem via HDMI output. On sound setting -> Output HDMI/DisplayPort disappears on "Play sound through" I have another HD on this PC running Fedora 17 desktop 64bit. There is no problem on sound output via HDMI. HDMI port found on "Play sound through" Graphic card ASUS 6450 Silent LP EAH6450 http://www.asus.com/Graphics_Cards/AMD_Series/EAH6450_SILENTDI1GD3LP/ The card has no problem with HDMI output, only without sound (HowTos)