The problem is external to kaffeine since it doesn't have privileges to touch dma settings. The problem has never been confirmed and reporter didn't respond for 10 month, so let's consider this is "fixed" ;)
** Changed in: kaffeine (Ubuntu)
Status: Needs Info => Rejected
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Kaffeine deactivates DMA in CDROM drive
https://launchpad.net/bugs/26061
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