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Alsa Channel Mapping and VLC : no stereo with 5.1 source audio

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http://www.linuxquestions.org – Hi, I have a strange issue with ALSA since 1.0.27 and VLC : VLC does not downmix 5.1 audio to stereo anymore with recent git pulls. I have a self compiled VLC git package made in april that works well. Slackware upgraded to 1.0.27 in may and then to 1.0.27.1 in june. Any newer VLC package I create do not apply downmix. I asked for help on the VLC forums and the VLC developpers told me channel mapping was an addition to alsa-lib 1.0.27 whose support was added to VLC in december 2012. Basically, my audio (HDA ATI SB) is now claiming that it is a 6 channels chip and so VLC applies a 6-channels se (HowTos)