HDMI input not reconised on 12.10 on ASUS N76

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http://askubuntu.com – I have a brand new ASUS N76 with newly installed 12.10. HDMI port is not recognized by Ubuntu while working perfectly well with Windows 8. xrandr does not even show as known connector : Output of xrandr Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 LVDS1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 382mm x 215mm 1920x1080 60.0*+ 59.9 40.0 [...] VGA1 disconnected (normal left inverted right x axis y axis) Any help is welcome. (HowTos)