I have the same problem. Also when I boot with acpi=off my touchpad and wifi do not work.
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/774005 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/774671 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/759103 Title: [STAGING] (Regression) Kernel panic with 2.6.38-8 and acpi on -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs