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[ubuntu] Front speakers stopped working after upgrade to 12.04

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linux-howto

http://ubuntuforums.org – Just as an introduction: before the upgrade to 12.04 I was only able to get surround sound working by using the AlsaUpgrade script to upgrade alsa to 1.0.25. Without that I would have only stereo options in Sounds Settings. The upgrade to to 12.04 overwrote the alsa on the system back to version 1.0.24, but Sound Settings does show 5.1 output. However, with that selected and using Test Sound only the rear and center/lfe speakers work properly. There is no sound from the front left and right speaker. The alsamixer levels were all okay. Re-running the AlsaUpgrade script brought the alsa ve (Hardware)