I just got another error with the stock kernel sources. It isn't something introduced by an Ubuntu patch.
I did some more google searching, and came across this: http://www.google.com/search?q=site:kerneltrap.org+%22failed+command%3A+READ+DMA%22 It looks like similar problems have been cropping up for various people over several different kernel versions. I don't really know what to do next. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/569680 Title: Hard disk write/read freezes for 10 seconds several times in session -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs