Hi Linux sound driver maintainers and authors, we have a little(?) problem that we discovered while experimenting with HDMI audio output on a Zotac ZBOX with NVIDIA ION GT218. We are using the embedded Angstrom distribution with kernel version 2.6.38.4 and NVIDIA proprietary driver version 260.19.21. Both the mainboard audio controller and the HDMI audio are driven by the in-kernel snd-hda-intel. lspci output is: 00:00.0 Class 0600: 8086:a000 00:1b.0 Class 0403: 8086:27d8 00:1c.0 Class 0604: 8086:27d0 00:1c.1 Class 0604: 8086:27d2 00:1c.2 Class 0604: 8086:27d4 00:1d.0 Class 0c03: 8086:27c8 00:1d.1 Class 0c03: 8086:27c9 00:1d.2 Class 0c03: 8086:27ca 00:1d.3 Class 0c03: 8086:27cb 00:1d.7 Class 0c03: 8086:27cc 00:1e.0 Class 0604: 8086:2448 00:1f.0 Class 0601: 8086:27bc 00:1f.2 Class 0101: 8086:27c0 00:1f.3 Class 0c05: 8086:27da 01:00.0 Class 0c03: 1106:3432 02:00.0 Class 0280: 168c:002b 03:00.0 Class 0300: 10de:0a64 03:00.1 Class 0403: 10de:0be3 04:0b.0 Class 0200: 10ec:8167 Relevant parts (decoded by http://kmuto.jp/debian/hcl/): 8086:27d8 Intel Corporation N10/ICH 7 Family High Definition Audio Controller 10de:0a64 nVidia Corporation GT218 [ION] 10de:0be3 nVidia Corporation High Definition Audio Controller The problem is that when the audio stream starts, the first one or two seconds are not audible, it's trimmed from the stream. I have found a few available test samples that show the problem at http://www.audiocheck.net/ The longer mono sample at http://www.audiocheck.net/Audio/audiocheck.net_welcome2.wav need to be converted to stereo before being playable on the HDMI output: sox audiocheck.net_welcome2.wav -c 2 audiocheck.net_welcome-stereo.wav When played with aplay -D hw:1,7 audiocheck.net_welcome-stereo.wav the "Welcome to" words at the very beginning are not audible. The next two samples at http://www.audiocheck.net/Audio/audiocheck.net_L.wav http://www.audiocheck.net/Audio/audiocheck.net_R.wav are shorter than 2 seconds and are not audible at all when played. When played with "aplay -D hw:0,0" over the mainboard device, all samples are OK. Does anyone know whether it's a known problem or maybe an already fixed one? I don't think it's TV-dependent as this problem can be reproduced on two or three different TV models. Thanks in advance, Zoltán Böszörményi -- ---------------------------------- Zoltán Böszörményi Cybertec Schönig& Schönig GmbH Gröhrmühlgasse 26 A-2700 Wiener Neustadt, Austria Web: http://www.postgresql-support.de http://www.postgresql.at/ ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
