[xubuntu] Can only boot with ACPI=OFF. HP Envy 17-j005tx

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http://ubuntuforums.org – Hi there, as the title says, I can only boot when I attach the acpi=off argument. I've tried installining Bumblebee, but that didn't work. Also, every so often, the computer will speed up to a crazy speed (gifs will be 1000% faster, pressing a key will sometimes enter it a dozen times.) As a side question, can someone please recommend a good touchpad driver? The cursor keeps moving around when I click, and because the left/right buttons are part of the touchpad, I keep accidentally switching workspaces when I click and drag. OS: Xubuntu 11.04 64-bit CPU: Intel CPU (Haswell) GPU: nVidia GT750 (Hardware)