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[ubuntu] sound only on the left speaker

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linux-howto

http://ubuntuforums.org – after installation of 12.10, only the left speaker produces sound (on 11.04, it was both) I went through the recommendations of all the threads which I found on ubuntuforums but - no, it doesn't work - problem seems to be "Playback channels: Mono" What can I do ? the information about my system is here: http://www.alsa-project.org/db/?f=8d...d4ec777e91546e Thank you (Hardware)