It does show up as "HDMI / Displayport 3" when on 3.8.0-17 kernel and the speaker-test works then even without specifing the exact device. I did the speaker-test on the 3.8.0-18 with your exact specs and it gave out this error:
speaker-test 1.0.25 Playback device is hdmi:0,2 Stream parameters are 48000Hz, S16_LE, 2 channels WAV file(s) Playback open error: -19,No such device I tried with changing hdmi:0,2 with different numbers than 2 but then it is just 'invalid argument' although through 'aplay -L' I get: default Playback/recording through the PulseAudio sound server sysdefault:CARD=MID HDA Intel MID, CONEXANT Analog Default Audio Device front:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog Front speakers surround40:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=MID,DEV=0 HDA Intel MID, Conexant Digital IEC958 (S/PDIF) Digital Audio Output hdmi:CARD=MID,DEV=0 HDA Intel MID, HDMI 0 HDMI Audio Output hdmi:CARD=MID,DEV=1 HDA Intel MID, HDMI 1 HDMI Audio Output hdmi:CARD=MID,DEV=2 HDA Intel MID, HDMI 2 HDMI Audio Output dmix:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog Direct sample mixing device dmix:CARD=MID,DEV=1 HDA Intel MID, Conexant Digital Direct sample mixing device dmix:CARD=MID,DEV=3 HDA Intel MID, HDMI 0 Direct sample mixing device dmix:CARD=MID,DEV=7 HDA Intel MID, HDMI 1 Direct sample mixing device dmix:CARD=MID,DEV=8 HDA Intel MID, HDMI 2 Direct sample mixing device dsnoop:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog Direct sample snooping device dsnoop:CARD=MID,DEV=1 HDA Intel MID, Conexant Digital Direct sample snooping device dsnoop:CARD=MID,DEV=3 HDA Intel MID, HDMI 0 Direct sample snooping device dsnoop:CARD=MID,DEV=7 HDA Intel MID, HDMI 1 Direct sample snooping device dsnoop:CARD=MID,DEV=8 HDA Intel MID, HDMI 2 Direct sample snooping device hw:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog Direct hardware device without any conversions hw:CARD=MID,DEV=1 HDA Intel MID, Conexant Digital Direct hardware device without any conversions hw:CARD=MID,DEV=3 HDA Intel MID, HDMI 0 Direct hardware device without any conversions hw:CARD=MID,DEV=7 HDA Intel MID, HDMI 1 Direct hardware device without any conversions hw:CARD=MID,DEV=8 HDA Intel MID, HDMI 2 Direct hardware device without any conversions plughw:CARD=MID,DEV=0 HDA Intel MID, CONEXANT Analog Hardware device with all software conversions plughw:CARD=MID,DEV=1 HDA Intel MID, Conexant Digital Hardware device with all software conversions plughw:CARD=MID,DEV=3 HDA Intel MID, HDMI 0 Hardware device with all software conversions plughw:CARD=MID,DEV=7 HDA Intel MID, HDMI 1 Hardware device with all software conversions plughw:CARD=MID,DEV=8 HDA Intel MID, HDMI 2 Hardware device with all software conversions -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1169836 Title: [Asus U50F, Intel IbexPeak HDMI, Digital Out, HDMI] No sound hdmi output To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1169836/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs