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[ubuntu_studio] MIDI keyboard not recognized in 12.04

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http://ubuntuforums.org – Hi all, I've just installed the latest version of ubuntustudio (12.04) and tried it. It's default config works really well except my MIDI keyboard is not recognized by jack (or alsa) anymore. The keyboard is a M-Audio Oxygen 8 v2 Class Compliant MIDI keyboard and was recognized out of the box by ALSA/JACK on my previous setup (Ubuntu 10.04). Symptoms are strange : * keyboard is recognized as a usb device * keyboard is recognized as an audio device * keyboard doesn't appear is ALSA tab in QJAckCtl Has anyone any idea why this is happening ? Thanks a lot ! Cheers jy PS : Below are some (Hardware)