Maybe you want to check this: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/505452/comments/41. This solution worked fine for me (I actually had no acpi support whatsoever after the dist-upgrade to lucid).
Maybe you want to check this: https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/505452/ comments/ 41. This solution worked fine for me (I actually had no acpi support whatsoever after the dist-upgrade to lucid).