Hello, I am stuck with playing back an AC3/DTS stream via my HDMI output. I have laptop running Ubuntu 10.10 (64bit), alsa version is 1.0.23, kernel is 2.6.35-30-generic. I ran the alsa-info.sh script and uploaded the result, it can be found here: http://www.alsa-project.org/db/?f=f452baaa10a73bcd37ac62c7b835ecc6c1c669c6 My setup is the following: the laptop is attached to my TV via HDMI, my surround receiver is attached to the TV via optical cable (the TV passes through the audio signal). I know it is possible to make the passthrough work, as I encounter the following strange behavior: If I watch a DVD with vlc I first get Stereo Output (vlc performs a downmix), the receiver tells me the incoming signal is 2.0/0. After a few minutes of playback I sometimes get a buffer underrun in vlc and now the receiver tells me he gets a 3.2/1 signal (it is immediately audible that it is now surround). aplay -L however lists no iec958 device: aplay -L null Discard all samples (playback) or generate zero samples (capture) default:CARD=Intel HDA Intel, ALC259 Analog Default Audio Device front:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog Front speakers surround40:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers dmix:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog Direct sample mixing device dsnoop:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog Direct sample snooping device hw:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog Direct hardware device without any conversions plughw:CARD=Intel,DEV=0 HDA Intel, ALC259 Analog Hardware device with all software conversions hdmi:CARD=NVidia,DEV=0 HDA NVidia, NVIDIA HDMI HDMI Audio Output hdmi:CARD=NVidia,DEV=1 HDA NVidia, NVIDIA HDMI HDMI Audio Output hdmi:CARD=NVidia,DEV=2 HDA NVidia, NVIDIA HDMI HDMI Audio Output hdmi:CARD=NVidia,DEV=3 HDA NVidia, NVIDIA HDMI HDMI Audio Output dmix:CARD=NVidia,DEV=3 HDA NVidia, NVIDIA HDMI Direct sample mixing device dmix:CARD=NVidia,DEV=7 HDA NVidia, NVIDIA HDMI Direct sample mixing device dmix:CARD=NVidia,DEV=8 HDA NVidia, NVIDIA HDMI Direct sample mixing device dmix:CARD=NVidia,DEV=9 HDA NVidia, NVIDIA HDMI Direct sample mixing device dsnoop:CARD=NVidia,DEV=3 HDA NVidia, NVIDIA HDMI Direct sample snooping device dsnoop:CARD=NVidia,DEV=7 HDA NVidia, NVIDIA HDMI Direct sample snooping device dsnoop:CARD=NVidia,DEV=8 HDA NVidia, NVIDIA HDMI Direct sample snooping device dsnoop:CARD=NVidia,DEV=9 HDA NVidia, NVIDIA HDMI Direct sample snooping device hw:CARD=NVidia,DEV=3 HDA NVidia, NVIDIA HDMI Direct hardware device without any conversions hw:CARD=NVidia,DEV=7 HDA NVidia, NVIDIA HDMI Direct hardware device without any conversions hw:CARD=NVidia,DEV=8 HDA NVidia, NVIDIA HDMI Direct hardware device without any conversions hw:CARD=NVidia,DEV=9 HDA NVidia, NVIDIA HDMI Direct hardware device without any conversions plughw:CARD=NVidia,DEV=3 HDA NVidia, NVIDIA HDMI Hardware device with all software conversions plughw:CARD=NVidia,DEV=7 HDA NVidia, NVIDIA HDMI Hardware device with all software conversions plughw:CARD=NVidia,DEV=8 HDA NVidia, NVIDIA HDMI Hardware device with all software conversions plughw:CARD=NVidia,DEV=9 HDA NVidia, NVIDIA HDMI Hardware device with all software conversions I tried playing back a Dolby Trailer (from http://www.digital-digest.com/movies/movie_index.php?type=dolby) with MPlayer on the command line and forcing ac3 playback, but I only get stereo output: mplayer -ac hwac3,hwdts, -ao alsa:device=hw=1.3 dolbyaurora/dolbyaurora.vob <snip/> Playing dolbyaurora/dolbyaurora.vob. MPEG-PS file format detected. VIDEO: MPEG2 720x576 (aspect 3) 25.000 fps 9800.0 kbps (1225.0 kbyte/s) <snip/> ========================================================================== Forced audio codec: hwac3 Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF hwac3: switched to AC3, 384000 bps, 48000 Hz AUDIO: 48000 Hz, 2 ch, ac3be, 384.0 kbit/25.00% (ratio: 48000->192000) Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF) ========================================================================== [AO_ALSA] alsa-lib: conf.c:4500:(parse_args) Unknown parameter AES0 [AO_ALSA] alsa-lib: conf.c:4633:(snd_config_expand) Parse arguments error: No such file or directory [AO_ALSA] alsa-lib: pcm.c:2208:(snd_pcm_open_noupdate) Unknown PCM hw:1,3,AES0=6 [AO_ALSA] Format ac3be is not supported by hardware, trying default. AO: [alsa] 48000Hz 2ch ac3le (2 bytes per sample) Starting playback... I also tried the following: mplayer -ac hwac3,hwdts, -ao alsa:device=iec958=NVidia dolbyaurora/dolbyaurora.vob which gives the following error: [AO_ALSA] alsa-lib: pcm_hw.c:1293:(snd_pcm_hw_open) open '/dev/snd/pcmC1D1p' failed (-2): No such file or directory [AO_ALSA] alsa-lib: pcm_hw.c:1293:(snd_pcm_hw_open) open '/dev/snd/pcmC1D1p' failed (-2): No such file or directory [AO_ALSA] Playback open error: No such file or directory Failed to initialize audio driver 'alsa:device=iec958=NVidia' Could not open/initialize audio device -> no sound. (there is no device 1, so there is no pcmC1D1p, just devices 3,7,8 and 9 but I do not know how to tell mplayer to use device 3 instead) I am now pretty much stuck. Any help would be greatly appreciated. If there is any more info necessary just tell me and will be happy to provide it. Or if there is any RTFM you recommend can recommend me doing (I have been all over the alsa-wiki already) I am grateful for any pointers. Thanks in advance! 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