To sum up, a CS-15 with an "original" firmware (x.62.40) does not work anymore even in current Lucid Lynx (some kind of a regression). CS-15 with updated firmware works in Lucid and Precise, but is unstable, and do not work in Quantal (live session) at all.
This is strongly related to firmware version the CS-15 happens to have. Take a closer look at: /bugs.launchpad .net/linux/ +bug/496256
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To sum up, a CS-15 with an "original" firmware (x.62.40) does not work anymore even in current Lucid Lynx (some kind of a regression). CS-15 with updated firmware works in Lucid and Precise, but is unstable, and do not work in Quantal (live session) at all.