Sorry for the late followup on this, but I eventually traced this to beign the fault of the nouveau driver in use, and it has been resolved via an update present in 11.10.
** Changed in: linux-lts-backport-natty (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/852972 Title: Kernel 2.6.38 Returns NAK bailout from sendbytes on startup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-backport-natty/+bug/852972/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs