I have a very similar behaviour (perhaps identical). Could it be related to the "**WARNING** I2C adapter driver [] forgot to specify physical device; fix it!", that was in my dmesg from 2.6.20-12? I attach a file with snippets of both outputs for comparison.
** Attachment added: "dmesg parts from -12 and -13 -generic kernels" http://librarian.launchpad.net/7093996/dmesg_before_after -- Kernel 2.6.20-13 acpi bug https://launchpad.net/bugs/96480 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
