I've experienced the same issue after upgrading to Hardy RC - DVD playback worked fine in Gutsy before then. Following the steps above resolved my issue and now DMA is enabled and DVD playback is back to normal.
Attached is my current dmesg output with the fix in place. If any other information from my machine is required please let me know. ** Attachment added: "dmesg output" http://launchpadlibrarian.net/13591976/bug_dmesg ** Tags added: dma dvd -- DVD playback jerky due to ata_generic module disabling DMA https://bugs.launchpad.net/bugs/175022 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
