The obvious reason why acpi isn't working here is because of an upgrade problem in the support packages.
The "errors" you pulled from dmesg are meaningless, except for the acpi_cpufreq, but I think the issue there is either your system (you've done something wrong), or the acpi packages mucking things up. Please repost the apt-get errors with LANG=C ** Changed in: linux-source-2.6.17 (Ubuntu) Sourcepackagename: linux-source-2.6.17 => acpid -- Multiple ACPI related issues after upgrade Dapper > Edgy https://launchpad.net/bugs/71465 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
